EP2753802A1 - Procede de commande d'un actionneur electromagnetique de soupape et dispositif de commande correspondant - Google Patents
Procede de commande d'un actionneur electromagnetique de soupape et dispositif de commande correspondantInfo
- Publication number
- EP2753802A1 EP2753802A1 EP12759167.5A EP12759167A EP2753802A1 EP 2753802 A1 EP2753802 A1 EP 2753802A1 EP 12759167 A EP12759167 A EP 12759167A EP 2753802 A1 EP2753802 A1 EP 2753802A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- engine
- actuator
- pallet
- coil
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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
- 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
- F01L9/40—Methods of operation thereof; Control of valve actuation, e.g. duration or lift
- F01L2009/408—Engine starting
-
- 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
- F01L2009/408—Engine starting
- F01L2009/4084—Cold start
Definitions
- the invention relates to a method of controlling a valve actuator and a device for implementing such a method.
- FIG. 1 An example of an actuator 1 is illustrated in FIG. 1 and comprises a pusher 2 acting on a valve 3.
- the pusher 2 is associated with a pallet 4 displaced under the effect of two electromagnets 5 and 6 and of springs 7 and 8 defining a equilibrium point of the pusher 2 between two extreme positions corresponding to the open and closed positions of the valve 3.
- the pusher 2, the pallet 4 and the valve 3 are guided in translation in the body of the actuator by bearings 10 and 11 lubricated by oil.
- the actuator can be subjected to very low temperatures, close to -30 ° C or -40 ° C, which cause the lubrication oil of the bearings 10 and 11 to freeze and therefore an increase in fluid friction incompatible with the operating requirements of the actuator.
- the heat generated is generally sufficient to heat the bearing of the pallet 4 and the bearing 11 of the pusher 2 located near the electromagnets. This heating is however inefficient and remains insufficient to warm the bearing 10 of the valve 3 away from the electromagnets.
- the subject of the invention is a method for controlling a valve actuator allowing an efficient start of the engine at low temperatures, especially when the engine oil is frozen.
- the invention relates to a control method, when starting an engine, in particular a vehicle, an electromagnetic actuator of at least one valve, in particular of the vehicle, the actuator comprising at least one actuating coil of a pallet integral with a valve pusher,
- the coil in order to carry out the valve opening phase, the coil is supplied to bring the valve to an intermediate position between an open position and a closed position of the valve when a predefined condition is satisfied.
- the engine is in particular a heat engine.
- the displacement of the valve to the intermediate position is then sufficient to obtain an opening of the associated conduit while requiring only limited energy to overcome the friction against the displacement of the valve towards its intermediate open position.
- the valve is arranged to open and close a conduit and the open position of the valve corresponds to the position in which the conduit is fully open while the closed position corresponds to the position in which the conduit is completely closed.
- the valve can then be returned from this intermediate position to the closed position, if necessary after being held in the intermediate position.
- the displacement of the valve between the intermediate position and the closed position can be continued as long as the predefined condition is not satisfied.
- the predefined condition relates for example to the result of the comparison between a measured value and a threshold value below or beyond which the control method during startup is implemented.
- the measured value is for example the ambient temperature. Alternatively, it may be the temperature of the oil in the engine or the temperature of the coolant.
- the measured value may correspond to the time elapsed since the last operation of the engine, for example since its last start or since its stop.
- the measured value may correspond to the viscosity of the oil in the engine.
- the measured value can be provided by a position sensor of the valve and the detection of the predefined condition is to determine the delay between a set position and the measured position. It is thus possible to estimate the fluid friction, knowing that at constant part inertia, the delay is due to the fluid friction in the bearings.
- the measured value may be provided by a valve speed sensor and it is detected whether the predefined condition is satisfied by comparing a set speed and the measured speed.
- valve opening phase can be performed by feeding the coil to move the pallet so as successively to bring the pusher into an open position and a closed position of the valve, according to a nominal mode of operation
- the valve In the intermediate position, the valve may have a lift equal to at most 15%, especially 10%, of the full lift that is reached when the valve is in the open position.
- the lifting in the intermediate position is for example between 5 and 10%, being for example of the order of 8.5% of the full lift.
- the valve is an engine intake valve which is a reciprocating internal combustion rotary combustion engine having a mode of nominal operation with a top dead center and a bottom dead center.
- the valve opening phase can be delayed or advanced relative to the top dead center.
- the valve opening phase is for example delayed compared to the top dead center of an angular value corresponding to the crankshaft angle to meet a set point imposed by the engine control unit (ECU).
- ECU engine control unit
- the valve can be brought to the intermediate position, maintained in this intermediate position for a given range of values for the crankshaft angle, and then returned to the closed position.
- the speed of the valve as it moves from the closed position to the intermediate position may be equal to that when it passes from the intermediate position to the closed position. These speeds can be low or high, an intermediate lift of less than 1 mm being achieved for example after a period of between 2 and 20 ms.
- the speed of the valve as it passes from the closed position to the intermediate position may be greater, especially double, at the speed of the valve as it moves from the intermediate position to the closed position.
- the transition from the closed position to the position in which the valve has an intermediate lift of 1 mm can be reached after a period of between 2 and 5 ms.
- the transition from the position in which the valve has the intermediate lift of 1 mm to the closed position can be done in a period of between 10 and 20 ms.
- the valve may remain open during its round-trip from the closed position to the intermediate position for a period during which the position of the crankshaft varies by at least 180 °.
- the valve In the intermediate open position, the valve may or may not have a maximum lift of between about 0.4 mm and about 1.3 mm, in particular equal to 1 mm or about 0.7 mm.
- the first or the first displacements of the valve towards its intermediate opening position may allow the engine to start, which will rapidly rise in temperature and heat up all the components associated with it. The process then goes into nominal operating mode. The heat required to heat the bearing oil is therefore produced by the engine itself. The process does not require external heating.
- the invention also relates to a control device for implementing this method.
- FIG. 1 illustrates a known valve actuating device whose programming allows the implementation of the invention
- FIG. 2 is a diagram showing the lifting profile of the valve in the cold start mode of the device driven according to an exemplary implementation of the invention, with the crank angle on the abscissa and the position of the valve on the ordinate.
- the exemplary implementation of the invention described hereinafter relates to a method of controlling a displacement actuator of a valve 3 of a vehicle comprising a heat engine when starting the engine.
- the method is applied in the example described to the control of an intake valve of a rotary internal combustion engine with reciprocating piston.
- the piston rotates a crankshaft.
- the motor operates in a manner known per se in a four-stroke cycle and has a nominal mode of operation with an upper intake dead center and a low intake dead point defined according to the angular position of the crankshaft on a cycle two turns, 720 degrees.
- the top dead center intake and bottom dead center are substantially 0 ° and 180 ° respectively.
- the valve 3 is arranged to open and close an intake duct 9 formed in a cylinder head of the engine and is for this purpose mounted on the cylinder head for sliding between an open position and a closed position.
- Figure 1 illustrates a valve actuator 1 comprising a proximal actuating coil 6 and a distal actuating coil 5 which are disposed in an actuator body.
- a pallet 4 extends between the actuating coils 5, 6.
- the pallet 4 is integral with a pusher 2 for moving the valve 3.
- FIG. 1 illustrates the actuator 1 in the neutral position, that is to say that the pallet 4 is equidistant between the coils 5 and 6 and that the valve 3 is in the intermediate position between the open position in which the intake duct 9 is completely open and the closed position in which the intake duct 9 is completely closed.
- the pusher 2 is guided in translation in the body of the actuator 1 by an actuator bearing 11 and can be moved between the open position by the proximal coil 6 fed to attract the pallet 4 and the closed position by the distal coil 5 powered to attract the pallet 4.
- the pusher 2 pushes the valve 3, assisted by a thrust spring 7, which causes the displacement of the valve 3 and the opening of the intake duct 9.
- the actuating coils 5, 6 are connected to a control unit of the actuator, comprising a control device incorporating, in a manner known per se, a processor executing a control program implementing the method of the invention.
- the control unit may be a dedicated control unit (for example of the VCU type of the "valve control unit") or the engine control unit (or ECU type of the "engine control unit”) .
- the control unit can also control power electronics components embedded in the vehicle.
- the actuator can be made according to the teaching of the application filed by the Applicant in France on June 27, 2011 under the number 1155718.
- the pallet 4 In a nominal operating phase, the pallet 4 is moved by the coils 5 and 6 successively between the open position and the closed position in order to open and close the intake duct 9 by the valve 3.
- the lifting maximum of the valve in nominal operating mode, when in the open position is in the example considered 0.55 mm
- the position of the valve 3 is followed by the control unit which is connected to position sensors of the valve 3 and / or the pallet 4. These sensors are known in themselves and are connected to the control device.
- the control program is arranged such that the control signal of the coils 5, 6 is subject to the position of the pallet 4 and / or the valve 3 in order to compensate for the inertia of the parts and the fluid friction.
- the control method of the invention includes a cold start mode prior to the nominal operating mode.
- the need to use the cold start mode is for example determined with respect to the verification of a predefined condition.
- This predefined condition relates for example to the ambient temperature and can then be used a room temperature sensor and compare the value provided by this sensor with a predetermined temperature threshold.
- the spool 5 is energized to release the pallet 4 so as to bring said pallet 4 at most to an intermediate open position to realize the opening phase of the valve 3 and then to recall it in closure position according to a profile generally designated A in Figure 2.
- the valve 3 In the intermediate open position, the valve 3 has a lift of between 0.4 mm and 0.7 mm and preferably, in the intermediate position of opening, the valve has a lift of
- the control unit drives the actuator in such a way that the opening phase is shifted with respect to the top dead center, this offset being able to correspond to a delay or an advance with respect to the high point of admission and the value of this offset is for example provided by the ECU.
- the control unit drives the actuator such that the profile A has a relatively low opening speed (represented by the slope B in FIG. 2) and a relatively low closing speed (represented by the slope C on the Figure 2).
- control unit When the control unit detects that maintenance of the cold start mode is no longer necessary, when the predefined condition is no longer satisfied, for example because the engine speed has exceeded the self-maintained idle speed or because the value of the detected viscous friction is less than a predetermined threshold value, the control unit causes the control device to pass into the nominal operating mode .
- the actuator is then driven according to the nominal operating mode of the control method which comprises the step of feeding the coils 5, 6 to draw the pallet 4 successively towards one and the other coil 5, 6 so as to bring the pusher 2 into an open position and a closed position of the valve 3 to perform the valve opening phase according to the nominal mode of operation.
- the method is not limited to bi-coil actuators such as that illustrated in Figure 1 but can also be used for single coil actuators.
- the control method can be used for the actuation of the valve (s) used in a vehicle, in particular with a heat engine. It may be an intake valve (s) and / or exhaust valve (s).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1158052A FR2979947B1 (fr) | 2011-09-09 | 2011-09-09 | Procede de commande d'un actionneur de soupape et dispositif de commande correspondant |
PCT/FR2012/051941 WO2013034834A1 (fr) | 2011-09-09 | 2012-08-28 | Procede de commande d'un actionneur electromagnetique de soupape et dispositif de commande correspondant |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2753802A1 true EP2753802A1 (fr) | 2014-07-16 |
EP2753802B1 EP2753802B1 (fr) | 2015-08-19 |
Family
ID=46851531
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12759167.5A Not-in-force EP2753802B1 (fr) | 2011-09-09 | 2012-08-28 | Procede de commande d'un actionneur electromagnetique de soupape et dispositif de commande correspondant |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2753802B1 (fr) |
FR (1) | FR2979947B1 (fr) |
WO (1) | WO2013034834A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1155718A (fr) | 1956-08-10 | 1958-05-07 | Grob & Co Ag | Lisse de tissage |
DE19914593C1 (de) * | 1999-03-31 | 2000-09-07 | Daimler Chrysler Ag | Verfahren zum Betrieb von Aktoren zur elektromagnetischen Ventilsteuerung |
JP3601365B2 (ja) * | 1999-08-06 | 2004-12-15 | 日産自動車株式会社 | エンジンの電磁動弁制御装置 |
JP2001336431A (ja) * | 2000-05-29 | 2001-12-07 | Toyota Motor Corp | 電磁駆動弁を有する内燃機関 |
FR2849101B1 (fr) | 2002-12-23 | 2006-09-22 | Johnson Controls Automotive Electronics | Actionneur electromagnetique de soupape bibobine a aimant permanent |
-
2011
- 2011-09-09 FR FR1158052A patent/FR2979947B1/fr not_active Expired - Fee Related
-
2012
- 2012-08-28 EP EP12759167.5A patent/EP2753802B1/fr not_active Not-in-force
- 2012-08-28 WO PCT/FR2012/051941 patent/WO2013034834A1/fr active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2013034834A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2753802B1 (fr) | 2015-08-19 |
FR2979947A1 (fr) | 2013-03-15 |
FR2979947B1 (fr) | 2013-10-04 |
WO2013034834A1 (fr) | 2013-03-14 |
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