Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
  • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
  • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F7/00—Magnets
  • H01F7/06—Electromagnets; Actuators including electromagnets
  • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
  • H01F7/14—Pivoting armatures
  • H01F7/145—Rotary electromagnets with variable gap
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
  • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
  • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
  • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
  • F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator

Definitions

• Electromechanical actuator for controlling a flow modulator of the pivoting flap type inside a pipeline.
• the present invention relates to an electromechanical actuator for controlling a flow modulator of the pivoting flap type inside a pipe.
• FR-A-2 613 089 discloses a method and a device for reducing such rapid fluctuations in the flow rate of a fluid flowing in a pipe.
• a flow modulator having the appearance of a flap or a butterfly valve pivotally mounted in a pipe and the object of which is the creation of an instantaneous pressure drop; its dimensions determined as a function of this last objective, can generally lead to a shape and to dimensions which do not allow the total sealing of the pipe.
• This modulator is controlled by a drive means such as a stepping motor.
• a stepping motor may have too long a response time.
• a device for controlling the pulsations of a fluid does not a priori include the angular position of the flow modulator as an operating parameter.
• knowledge of this position is essential if a stepper motor is used. It is therefore necessary to have, in addition to the stepping motor, a device for pinpointing the angular position of the flow modulator.
• the present invention aims to provide an actuator
• the present invention relates to an electromechanical actuator for controlling a shutter type flow modulator which is pivotally mounted inside a pipe and which is intended to create a very rapidly variable pressure drop in a fluid flowing at inside the pipeline, the actuator comprising a fixed part or stator, and a rotary mounted part or rotor, integral in rotation with the flow modulator, the stator and the rotor being provided with electromagnetic elements such as coils and possibly permanent magnets, which, when crossed by a current, are in an electromagnetic interaction situation which generates angular displacements of the rotor, only within a predetermined angular sector, characterized in that he has a return device which, during the oscillations of the rotor around a reference angular position, stores the kinetic energy of the rotor and the flow modulator during angular decelerations of the rotor and returns it at least partially to the actuator during accelerations rotor angles.
• electromagnetic elements such as coils and possibly permanent magnets
• the actuator comprises adjustment means able to move the reference angular position of the rotor relative to the pipe to make it substantially coincide with the average angular position of the oscillating flow modulator in the pipeline.
• the angular sector within which the rotor oscillates is between approximately 15 and 35 °, and preferably between approximately 20 and 30 °.
• the actuator according to the invention has the advantage that the rotor and the flow modulator are integral with the same drive axis, hence a reduced moment of inertia.
• the actuator can communicate to the flow modulator oscillation movements at high frequencies.
• the actuator has its own resonant frequency, which is advantageously chosen from the range of oscillation frequencies of the actuator. It is therefore sufficient to provide a sufficient energy difference to give the rotor the required operating frequency, which is close to the resonant frequency of the actuator.
• the actuator according to the invention has the advantage of being able to reach high oscillation frequencies while consuming little energy during its operation.
• one of the advantages of the actuator according to the invention is that it can achieve higher oscillation frequencies than in the absence of the return device; in fact, the maximum frequency is fixed by the motor torque, that is to say by the electromagnetic power available per unit of rotor volume.
• the maximum frequency is fixed by the motor torque, that is to say by the electromagnetic power available per unit of rotor volume.
• the return device by allowing mechanical energy storage independent of the engine torque, without implementing significant inertia, thus ensures an additional instantaneous effective torque on the flow modulator.
• This advantage is essential in the case of using the actuator on board a motor vehicle, to control the gases circulating in its exhaust line, since there is only one limited energy source.
• the actuator return device is of the electromagnetic type and comprises a sensor for measuring the angular position of the rotor, electromagnetic elements comprising an electrical circuit arranged on the rotor and on the stator , and an electrical accumulator which stores the quantity of electricity produced in said electrical circuit during the angular decelerations of the rotor and which supplies the actuator with electrical energy during the angular accelerations of the rotor.
• the accumulator may simply be the accumulator of the vehicle. It is understood that, in this embodiment, the second electrical circuit plays the role of a generator which recovers the kinetic energy of the rotor and the flow modulator during the deceleration phases of the rotor and transmits it to the accumulator.
• the electrical circuit of the return device consists of the electrical circuit of the actuator, switching means making it possible to switch this circuit to the actuator position or to the energy recovery position.
• switching means making it possible to switch this circuit to the actuator position or to the energy recovery position.
• a device of the reversible chopper type can be used for this purpose.
• the actuator is then used alternately as a motor to activate the flow modulator and as an alternator to charge the electric accumulator.
• the resonant frequency specific to such an actuator depends on its electrical energy recovery circuit. By varying certain parameters of this circuit, it is therefore possible to modify its resonant frequency, which is a considerable advantage insofar as, as explained previously, the operation of the actuator is particularly economical in a range of frequencies close to its resonant frequency.
• the angular position of the rotor can be moved relative to the pipe to make it coincide with the average position of the flow modulator, which makes it possible to improve actuator operation.
• the return device is of the mechanical type and comprises an elastic member which is integral with the rotor on the one hand and the stator on the other hand.
• the kinetic energy of the rotor and of the flow modulator, during the phases of deceleration of the rotor is here stored in the form of potential energy by the elastic member, which can for example be constituted by a spring in the form of a spiral.
• the elastic member releases its potential energy and participates in the actuation of the flow modulator.
• the virtual absence of friction as well as the direct transformation of kinetic energy into energy potential increase the energy efficiency of such a reminder device.
• this actuator has a fixed resonance frequency. It therefore does not adapt as easily as the previous one to the different ranges of oscillation frequency of the flow modulator.
• this embodiment makes it possible to increase the value of the torque for the high frequencies, since this energy storage device makes it possible, as has been said previously, to add to the value of the electromagnetic torque a mechanical torque to which no significant additional inertia is associated.
• the actuator can include both an electromagnetic return device and a mechanical return device.
• Such a configuration makes it possible to obtain an actuator capable of operating efficiently in a wider range of frequencies, by modifying its resonant frequency by combining energy efficiency and adaptability.
• the actuator comprises a rest position which is a fixed position corresponding to a safety position of the flow modulator in the event of a malfunction or failure of the actuator.
• the rest position of the actuator corresponds to that in which the flow modulator is maintained in an open position.
• FIG. 1 schematically represents a pipe fitted with an actuator according to the invention
• FIG. 2 represents a first embodiment of an actuator according to the invention
• FIG. 3 shows a second embodiment of an actuator according to the invention.
• FIG. 1 there is shown a pipe 1 in which circulates a pulsed fluid whose movement is materialized by an arrow.
• a butterfly valve 2 is pivotally mounted around an axis 3 inside this pipe 1, and here constitutes a flow modulator within the meaning of the present invention.
• An actuator 4 according to the invention is connected to the butterfly valve 2 by a drive shaft.
• This actuator 4 is controlled by electrical signals conveyed by electrical wires 6 entering the housing of the actuator 4.
• electrical signals conveyed by electrical wires 6 entering the housing of the actuator 4.
• FIG. 2 shows a first embodiment of the actuator according to the invention.
• This actuator comprises a central part 7 rotatably mounted which constitutes the rotor and a peripheral peripheral part 8 which constitutes the stator.
• the rotor 7 is a permanent magnet with two poles 7a and 7b, while the stator 8 is produced by soft iron elements 8a and 8b each surrounded by a coil 9.
• the rotor is pivotally mounted around the shaft 5.
• the parts 8a and 8b of the stator are integral with a frame 10 on which they are held by lugs 11.
• Switching means 12 connect the windings 9 of the stator 8 alternately to the electrical conductor wire 6 carrying the control signals and to an accumulator 13.
• a command 14 activates the switching means 12 as a function of the angular position of the rotor which is supplied to it by a position sensor 15 mounted on the drive shaft 5.
• control 14 makes the connection between the electrical signals conveyed by the wires 6 and the stator windings 9.
• the angular position sensor 15 indicates to the control 14 that the rotor 7 is in the deceleration phase.
• the switching means On a signal from control 14, the switching means
• the actuator behaves like an alternator which generates electrical energy, which is stored in the accumulator 13.
• the control 14 activates the switching means 12 to reconnect the wires 6 which convey the electrical signal for controlling the actuator to the coils 9.
• the electrical energy stored in the accumulator 13 is returned to the actuator by means of the electrical signals conveyed by the wires 6, these signals coming from an electronic control device, not shown, the supply of electrical energy of which is provided at least partially by the accumulator 13.
• the device shown in Figure 2 has the advantage of being able to adapt to any type of oscillation, because its own resonant frequency is variable.
• the actuator shown in Figure 3 is of an embodiment significantly simpler than the previous one.
• the return device here consists of a spiral-shaped spring 16 which is integral on the one hand with the chassis 10, and on the other with the drive shaft 5.
• the electrical circuit for supplying the windings 9 of the stator 8 has not been shown.
• the return device is of the mechanical type, the kinetic energy of the rotor being accumulated by the spring 16 in the form of potential energy.
• the energy efficiency of the reminder device is high and the operating frequencies are higher than those obtained by means of the embodiment of FIG. 2.
• the return devices shown in FIGS. 2 and 3 could be combined, which would make it possible to combine both the high energy efficiency of a mechanical return device with the adaptability of a device electromagnetic reminder.
• the reference position around which the rotor oscillates is a fixed position.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Reciprocating, Oscillating Or Vibrating Motors (AREA)
• Control Of Turbines (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9431256

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (19)

Family Cites Families (5)

• 1992
  • 1992-06-26 FR FR9207899A patent/FR2693055B1/fr not_active Expired - Fee Related
• 1993
  • 1993-06-25 EP EP93913196A patent/EP0647348B1/de not_active Expired - Lifetime
  • 1993-06-25 US US08/356,266 patent/US5785296A/en not_active Expired - Lifetime
  • 1993-06-25 ES ES93913196T patent/ES2093434T3/es not_active Expired - Lifetime
  • 1993-06-25 JP JP06502112A patent/JP3113679B2/ja not_active Expired - Lifetime
  • 1993-06-25 WO PCT/FR1993/000643 patent/WO1994000858A1/fr active IP Right Grant
  • 1993-06-25 DE DE69305515T patent/DE69305515T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events