EP0995023A1 - Circuit de commande de puissance pour actionneur electromagnetique tel qu'injecteur ou electrovanne - Google Patents
Circuit de commande de puissance pour actionneur electromagnetique tel qu'injecteur ou electrovanneInfo
- Publication number
- EP0995023A1 EP0995023A1 EP98936459A EP98936459A EP0995023A1 EP 0995023 A1 EP0995023 A1 EP 0995023A1 EP 98936459 A EP98936459 A EP 98936459A EP 98936459 A EP98936459 A EP 98936459A EP 0995023 A1 EP0995023 A1 EP 0995023A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- capacitor
- switching means
- induction coil
- closing
- 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
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
-
- 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
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
- H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
- F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
- F02D2041/201—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost inductance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
- F02D2041/2013—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost voltage source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
- F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D2041/389—Controlling fuel injection of the high pressure type for injecting directly into the cylinder
-
- 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
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
- H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
- H01F2007/1822—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator using a capacitor to produce a boost voltage
Definitions
- the invention relates to a power control circuit for supplying electric current to an actuating coil of at least one electromagnetic actuator, such as a solenoid valve or a fuel injector, in particular for a combustion engine. internal direct injection.
- electromagnetic actuators such as solenoid valves, in particular for exhaust gas recirculation installations of internal combustion engine of motor vehicles, and fuel injectors of internal combustion engines, include coils or windings of 'actuations to be powered by high intensity inrush currents, quick establishment and cutoff, in order to obtain precise actuation times, in particular precise times of fuel injection by injectors.
- an injection engine in terms of both the power delivered, the pollution and the consumption, supposes that the injectors have a very short response time at opening as at closing, so that the effective durations of the fuel injection phases by the injectors correspond as precisely as possible to the durations calculated by an electronic control and calculation unit, commonly called engine control computer, which notably controls the injection of fuel, and, if necessary, ignition from engine operating parameters, such as engine speed, air pressure at the intake manifold, engine coolant temperature, oxygen content in gases which are detected by appropriate detectors.
- engine control computer which notably controls the injection of fuel, and, if necessary, ignition from engine operating parameters, such as engine speed, air pressure at the intake manifold, engine coolant temperature, oxygen content in gases which are detected by appropriate detectors.
- the electromagnetic injectors are opened by the supply of electric current to their actuating coil so as to develop a sufficiently intense electromagnetic force on a movable member of the injector, called a needle, for the deviate, against return springs, from a seat against which it is kept applied with sealing by said springs in the closed position.
- FR-A-2 425 137 such a power control circuit has been proposed with an energy accumulation stage by charging a self-induction coil connected to the low-voltage power source and associated with first switching means controlled on closing to charge the self induction coil, then on opening at the same time as second switching means, associated with the actuating coil of the electromagnetic actuator and previously opened are ordered to close, to discharge the self induction coil in the actuating coil and obtain in the latter the rapid establishment of a current d 'high appeal.
- the actuating coil of the electromagnetic actuator is used directly as a self-induction coil for the accumulation of energy in the stage. booster, in order to simplify the implementation and reduce the cost of such power control circuits.
- the problem underlying the invention is to improve these known power control circuits so that their energy storage stage can store and then discharge more energy than the known circuits in order to be able to actuate electromagnetic actuators.
- the power control circuit of the invention is characterized in that said self-induction coil is distinct from said actuation coil, and in that after charging the capacitor and before supplying said actuating coil, said switching control unit controls the closing of said first switching means for charging said self induction coil, so that on closing of said second switching means, said actuating coil is supplied by the simultaneous discharge of said capacitor and said self induction coil.
- the power control circuit of the invention is neither more complex nor significantly more expensive, and essentially requires a modification of the control mode of the switching means which is provided by the switching control unit.
- This modification of the control mode is reduced to a modification of control software when, advantageously, the switching means comprise electronic switches, in particular transistorized switches, controlled by a logic command delivered by the switching control unit, which comprises at minus a microprocessor or microcontroller.
- the circuit of the invention advantageously further comprises third switching means, interposed between the power source and the self-induction coil, and controlled by the closing control unit to ensure the initial charges of the capacitor and the self induction coil, then, after the closing of the second switching means, cyclically controlled at opening and closing to ensure in the actuating coil, a holding current of intensity lower than that of the resulting inrush current simultaneous discharge of the capacitor and the inductor coil.
- the coil of self induction and the capacitor can, in combination with the third switching means, serve for the maintenance of a holding current, thanks to a structure of converter from direct current to direct current which has the advantage of being with low electromagnetic radiation, because it can operate in quasi-resonance, so that the power circuit of the invention can comply with the more stringent electromagnetic emission standards which will soon be in force, in particular for equipment on board vehicles automobiles, such as solenoid valves and injectors, in particular for direct fuel injection installations.
- third switching means it is possible, after the closing of the second switching means controlling the simultaneous discharge of the capacitor and of the self-induction coil in the actuating coil, and before the delivery of the holding current, to cyclically control the third means switches on opening and closing by the switching control unit, so as to maintain the inrush current at an intensity close to that resulting from the simultaneous discharge of the capacitor and the self induction coil in the coil actuation.
- This maintenance phase of the inrush current at a high level can thus take place between the initial phase of rapid establishment of the inrush current and the phase of establishment of the sustaining current at a lower level of intensity.
- the third switching means are advantageously controlled by the control unit with a variable opening cyclic ratio to ensure the holding current and / or maintain the inrush current.
- the second switching means are controlled on opening by the control unit, preferably when the actuating coil is traversed by the holding current, so as to quickly cancel the current in this coil, to obtain a brief cut in current, necessary to obtain good operating accuracy of the actuator.
- the circuit of the invention is also advantageous in that the booster stage can supply the actuating coils of at least two electromagnetic actuators in parallel, and in particular the coils of all the injectors of a motor with internal combustion.
- the second and third switching means can be controlled on closing so as to obtain a recovery of the supply durations of at least two actuating coils, which makes it possible to manage the recoveries of injection duration, with a single power circuit this, in the case of applications to injection engines.
- the third switching means and the self-induction coil form a converter which advantageously ensures an increase in the holding current during these recoveries.
- FIG. 1 is a block diagram of the circuit of the invention for the parallel supply of the actuating coils of four injectors of an internal combustion engine of a direct injection vehicle
- - Figure 2 is a timing diagram representing the changes in the voltage Vout at the common terminal of the capacitor and the charging diode and in the current iL of the self-induction coil as a function of the logic command of the first switching means during the phase of successive charges of the capacitor
- FIG. 3 is a timing diagram schematically representing the evolution of the current i in an injector coil and the logic control of the second and third switching means for maintaining the inrush current and then obtaining the holding current, until the current in this coil
- FIG. 4 represents timing diagrams showing in superposition the evolution respectively of the current i in an injector coil and of the voltage V at the terminals of this coil, as a function of the logic control of the first switching means during the discharge phase,
- FIG. 5 represents the evolution of the current iL in the self-induction coil during the discharge
- FIG. 6 shows timing diagrams showing the evolution of the currents il and i2 in the case of overlapping of the supplies of two injector coils, thus that the current iL in the inductive coil as a function of the logic commands of the first and third switching means in the recovery phase.
- the power control circuit of FIG. 1 comprises a self-induction coil 1 connected by one end in series with a switch 2 connected to the "+" terminal of a low voltage direct current power supply source Vbat, which is the battery of a motor vehicle, the "-" terminal of which is earthed.
- Vbat low voltage direct current power supply source
- the coil 1 is connected in parallel to another switch 4, connected to ground, and, via a diode 5, on the one hand to a terminal of a capacitor 6, of which the 'other terminal is connected to ground, and, secondly, to four actuator coils of injectors 7, 8, 9 and 10, which are connected in parallel with each other, and each of which is connected to ground via one of four power switches, respectively
- each injector coil 7 to 10 being limited, for example to around 80V, by a Zenner diode 15 in parallel on the switch 11,
- a capacitor 17, with a value of approximately 0.5 ⁇ F to approximately 5 ⁇ F, and a reverse diode 18 are each mounted in parallel on the switch 2, and the diode 18 may be the diode integrated in a switching transistor. type M0S channel P constituting the switch 2.
- a reverse diode 19 is connected in parallel to the switch 4, and this diode can be the integrated diode of a switching transistor of the MOS type channel N constituting the switch 4 .
- All the switches 2, 4, 11, 12, 13 and 14 are solid-state electronic switches controlled on opening and closing by logic control signals of low and high levels delivered by a logic switching control unit 16 to microprocessors or microcontrollers, and which is connected to each of the switches ters controlled by a command line.
- the coil 1, for example having a self-induction coefficient of about 10 ⁇ H to about 50 ⁇ H, is an energy storage coil.
- the capacitor 6, for example with a capacity of between 1 and 10 ⁇ F, is a capacitor of a technology other than chemical, preferably, for storing capacitive energy and for ensuring an energy transfer from the coil of self induction 1 to at least one injector coil 7 to 10.
- the switch 4 is cyclically controlled on closing and opening by the unit 16 to ensure, when the switch 2 is closed, charging the coil 1, for a time varying from approximately 20 ⁇ s to approximately lOO ⁇ s, when the switch 4 is closed, then to ensure the charging of the capacitor 6 through the diode 5, by transfer of inductive energy originating from the coil 1, when switch 4 is open.
- the switch 2 is also controlled to close by the unit 16 for a time of approximately 10 ⁇ s to approximately 70 ⁇ s, to ensure the charging of the coil 1, then, in a later phase explained below, the switch 2 is controlled cyclically upon closing and opening by the unit 16 to ensure that the current is maintained at a determined value, of approximately 3 to 5 A, in at least one of the injector coils 7 to 10 supplied by closing the corresponding switch 11 to 14. Indeed, each of the switches 11 to 14 is intended to ensure the conduction of the corresponding injector coil 7 to 10.
- the diode 5 has the function of preventing the discharge of the capacitor 6 by the switches 2 and 4 when they are closed.
- the operating sequence of the circuit, controlled by the unit 16 is as follows: the closing of the switches 2 and 4 causes the load of the coil 1, traversed by a current iL which increases linearly by 0 to approximately 15 A for a time of approximately 20 ⁇ s to approximately 100 ⁇ s.
- the open The switch 4 causes the capacitor 6 to charge by energy transfer from the coil 1 to the capacitor 6, through the diode 5.
- the voltage across the capacitor 6 increases in an exponential curve, at the same time as occurs a current peak.
- This sequence comprising a charge of the coil 1 followed by a charge of the capacitor 6 is renewed a certain number of times until the capacitor 6 is charged at a voltage of approximately 80 V. This sequence of successive charges is represented in FIG.
- one of the switches of injector for example the switch 11, is closed, while the switch 2 remains closed and the switch 4 is open (see FIGS. 3 and 4), so that discharge of the coil occurs simultaneously 1 and of the capacitor 6 in the injector coil 7, traversed by an intense inrush current, which reaches 15 to 20 A after a time of 30 to 50 ⁇ s, and corresponds to the sum of the currents resulting from the capacitive discharge of the capacitor 6 and the inductive discharge of the coil 1. This establishes The rapidity of an intense inrush current is visible on the curves of Figures 3 and 4.
- the control unit 16 cyclically controls the switch 2 with a variable opening duty cycle, which is then lowered to decrease the current to an intensity of approximately 3 to 5 A , then maintain it around this value to ensure a maintenance current for the injector in its coil 7.
- the booster stage comprising the coil 1, the diode 5, the switch 4 and the capacitor 6, supplies the injector coils 7 to 10 in parallel.
- the switch 2 and the two switches, for example 11 and 12 of the two coils of injectors 7 and 8 to be supplied with recovery, are controlled on opening by the control unit 16 so as to ensure this recovery of the supply times.
- the curves (a) and (b) of Figure 6 show the currents il and i2 in the injector coils 7 and 8 after the two time-shifted closings of switch 4 - see curve (d) - to charge the coil 1 just before the offset closings of switches 11 and 12, which are at the origin of the currents il and i2.
- the charges of the coil 1 resulting from the closings of the switch 4 are visible on the curve (c) of FIG. 6, representing the current iL in this coil 1.
- the control of the switch 2 with a variable duty cycle after the openings of the switch 4 allows the holding current to be maintained and then the holding current to be obtained.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9708726A FR2766005B1 (fr) | 1997-07-09 | 1997-07-09 | Circuit de commande de puissance, pour actionneur electro-magnetique tel qu'injecteur ou electro-vanne |
FR9708726 | 1997-07-09 | ||
PCT/FR1998/001452 WO1999002834A1 (fr) | 1997-07-09 | 1998-07-07 | Circuit de commande de puissance, pour actionneur electromagnetique tel qu'injecteur ou electrovanne |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0995023A1 true EP0995023A1 (fr) | 2000-04-26 |
EP0995023B1 EP0995023B1 (fr) | 2002-04-10 |
Family
ID=9509055
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98936459A Expired - Lifetime EP0995023B1 (fr) | 1997-07-09 | 1998-07-07 | Circuit de commande de puissance pour actionneur electromagnetique tel qu'injecteur ou electrovanne |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0995023B1 (fr) |
DE (1) | DE69804801T2 (fr) |
FR (1) | FR2766005B1 (fr) |
WO (1) | WO1999002834A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19911863A1 (de) * | 1999-03-17 | 2000-09-21 | Philips Corp Intellectual Pty | Schaltungsanordnung zum Steuern eines Aktuators |
DE19922485B4 (de) * | 1999-05-15 | 2008-06-12 | Robert Bosch Gmbh | Verfahren und Schaltungsanordnung zur Ansteuerung eines Doppelspulen-Hochdruckeinspritzmagnetventils für die Kraftstoffeinspritzung |
GB0107555D0 (en) * | 2001-03-27 | 2001-05-16 | Bae Systems Plc | Electromagnetic actuation |
FR2826200B1 (fr) * | 2001-06-15 | 2004-09-17 | Sagem | Procede d'alimentation d'un equipement electrique |
DE10257840A1 (de) * | 2002-12-11 | 2004-07-15 | Robert Bosch Gmbh | Vorrichtung zur Steuerung eines Verbrauchers |
EP1653066B1 (fr) * | 2004-10-08 | 2007-02-07 | C.R.F. Società Consortile per Azioni | Un dispositif pour commande de soupape électronique d'injection et de soupape électronique d'un moteur à combustion interne et méthode pour celui-ci. |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1218673B (it) * | 1987-08-25 | 1990-04-19 | Marelli Autronica | Circuito per il controllo di carichi induttivi in particolare per il comando degli elettroiniettori di un motore a ciclo diesel |
IT1217171B (it) * | 1987-08-25 | 1990-03-14 | Marelli Autronica | Circuito per il pilotaggio di carichi induttivi in particolare per il comando degli elettroiniettori di un motore a combustione interna a ciclo diesel |
-
1997
- 1997-07-09 FR FR9708726A patent/FR2766005B1/fr not_active Expired - Fee Related
-
1998
- 1998-07-07 WO PCT/FR1998/001452 patent/WO1999002834A1/fr active IP Right Grant
- 1998-07-07 DE DE69804801T patent/DE69804801T2/de not_active Expired - Fee Related
- 1998-07-07 EP EP98936459A patent/EP0995023B1/fr not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9902834A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2766005B1 (fr) | 1999-09-17 |
DE69804801D1 (de) | 2002-05-16 |
DE69804801T2 (de) | 2002-11-28 |
FR2766005A1 (fr) | 1999-01-15 |
WO1999002834A1 (fr) | 1999-01-21 |
EP0995023B1 (fr) | 2002-04-10 |
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