EP1647693A1 - Verfahren zum Ansteuerung einer Steuerschaltung und Betätigungseinrichtung - Google Patents
Verfahren zum Ansteuerung einer Steuerschaltung und Betätigungseinrichtung Download PDFInfo
- Publication number
- EP1647693A1 EP1647693A1 EP05300831A EP05300831A EP1647693A1 EP 1647693 A1 EP1647693 A1 EP 1647693A1 EP 05300831 A EP05300831 A EP 05300831A EP 05300831 A EP05300831 A EP 05300831A EP 1647693 A1 EP1647693 A1 EP 1647693A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bridge
- low threshold
- actuator
- measurement signal
- terminals
- 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
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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
-
- 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
- F02D41/20—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
- F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
-
- 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
- F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
- F02D2041/2072—Bridge circuits, i.e. the load being placed in the diagonal of a bridge to be controlled in both directions
Definitions
- the invention relates to the field of fuel injection control for an internal combustion engine intended for example to equip a motor vehicle.
- the invention more particularly relates to a fuel injection control for atomizing the injected fuel in the form of very fine droplets.
- the fuel injection devices currently used on internal combustion engines fitted to motor vehicles or road vehicles operate conventionally on the model of a valve whose open or closed state is permanently controlled, the dosage of fuel injected then being done directly by the opening time.
- Such injection systems comprise an electric fuel supply pump which supplies, through the channel of a distribution manifold, all the injectors under pressure having a constant difference with the pressure prevailing in the intake manifold. thanks to a pressure regulator.
- a pressure regulator By electronically controlling the electromagnet actuating the valve of each injector, it controls the start and the opening time thereof and then determines a precise fuel flow for each of the injectors.
- the amount of fuel injected depends solely on the opening time of the electro-injectors.
- the injectors of the electromagnetically controlled needle type which are the most commonly used, however, have limits which slow down the improvement of engine performance, especially in terms of pollution control.
- the time taken to open or close the needles are still too high, about 1 to 2 ms, which prevents the distribution of the injection correctly throughout the opening time of the valve.
- the minimum opening time which determines the minimum dose of fuel that can be injected, is still too important for certain operating points of the engine.
- Known needle injectors also have injection orifices of relatively large diameters to allow the required quantities of fuel to be discharged for operation at full load and high speeds of the engines. This arrangement generates fuel jets having drops of large dimensions, which slows the vaporization of the fuel (and therefore the preparation of the fuel mixture) and is able to promote the phenomenon of wall wetting.
- the non-vaporized fuel tends to be deposited on the walls of the intake duct or the direct injection combustion chamber.
- Such a deposit causes metering problems, particularly acute transients for lack of knowledge of the amount of fuel that actually enters the corresponding combustion chamber.
- This wetting phenomenon is one of the important causes of high pollutant emissions during cold engine starts.
- the document FR-A-2 801 346 describes a fuel injection device for an internal combustion engine equipped with an injector comprising a fuel-fed nozzle and at the end of which is provided an injection orifice, means for injecting fuel.
- an injector comprising a fuel-fed nozzle and at the end of which is provided an injection orifice, means for injecting fuel.
- of cyclic vibration of the nozzle such as a transducer controlled in duration and intensity by the electronic engine control system, and shutter means biased by elastic return means against the end of the nozzle, said elastic means of recall being formed by a rod passing through the body of the injector to a cavity located at the opposite end relative to the injection orifice, said rod cooperating with a mass and damping means housed in said cavity , vibrating the nozzle and shutter means ensuring the ejection of a predetermined amount of fuel.
- Document FR-A-2 846 808 describes an actuator device provided with an actuator, an electronic actuator control topology comprising a bridge circuit with a DC source between the first and second terminals of the circuit, the actuator being connected between the third and fourth terminals of the circuit, having a switch connected between the first and third terminals and a switch connected between the second and fourth terminals.
- the bridge circuit further has a first diode connected between the first and fourth terminals and a second diode connected between the second and third terminals.
- the control method is intended for a control circuit of an actuating device provided with at least one actuator having an actuated part and an electric control member for moving the actuated part.
- the control circuit comprises a bridge.
- the electrical control unit is connected in the bridge.
- the process comprises the steps of supplying the bridge circuit with a continuous signal, producing at least one measurement signal representative of the position of the actuated part, selectively interrupting the conduction in at least one branch of the bridge as a function of the measurement signal, the step of production of the measurement signal comprising comparing the intensity respectively measured at a high threshold, a low threshold and a very low threshold, and developing the measurement signal according to the result of the comparison. This gives a command in particularly precise position.
- At least one branch of the bridge is open circuit.
- the detection of the very low threshold at zero means that the measured intensity is below the very low threshold.
- two branches of the bridge are put in open circuit.
- control is performed in variable frequency ripple, for example in modulation of the pulse width.
- the actuator acts on a fuel injector.
- the invention also proposes an actuating device comprising at least one actuator provided with an actuated part and an electrical component for controlling the displacement of the actuated part, a control circuit for the actuator provided with a bridge, and a device for controlling at least one bridge switch, the bridge comprising a DC source connected to first and second terminals of said bridge, the electrical control member being connected between the third and fourth terminals of said bridge.
- the bridge comprises at least one switch connected between the first and third terminals or between the second and fourth terminals, a current measuring element flowing in the electrical control element, a high threshold detector of said current, and a threshold detector. bottom of said current.
- the device further comprises a very low threshold detector of said current flowing in the electrical control element.
- the invention allows a particularly precise control of the moving part of an injector.
- the device comprises at most three active switches per controlled injector.
- the device comprises at most n + 2 active switches for n controlled injectors.
- the device comprises at most 2n active switches for n controlled injectors.
- the active switches are MOS transistors.
- the very low threshold detector is used to detect the presence of current in the coil.
- the very low current information delivered by said very low threshold detector makes it possible to better control the amplitude of the ripple.
- the invention proposes an actuating device having an electronic topology for controlling an actuator with simplified structure and control.
- One or two antiparallel diodes are used in a bridge circuit, resulting in a decrease in the number of active switches and a simplification of the control.
- the actuating device 1 comprises a bridge circuit 2, a control unit 3 and a detection unit 4.
- the bridge circuit 2 comprises four terminals 5, 6, 7, 8, a DC voltage source 9, for example a battery or a DC AC power converter connected to the first and second terminals 5 and 6 of the bridge 2 and provides a voltage keep on going. Alternatively, it can be provided that the source 9 provides a continuous intensity.
- the electrical control member 10 for controlling the actuator is connected between the third and fourth terminals 7 and 8 of the bridge circuit 5. In electrical terms, the electrical control member 10 is likened to an inductor.
- a first switch 11 is connected between the first and third terminals 5 and 7 and a second switch 12 is connected between the second and fourth terminals 6 and 8.
- the bridge circuit 2 may be in the form of an integrated circuit in which MOS transistors are provided which can be used as switches 11 and 12.
- the switching of the switches 11 and 12 is controlled via the control unit 3, to which the control terminals of said switches 11 and 12 are connected.
- the bridge circuit 2 further has first and second diodes 13 and 14.
- the first diode 13 is connected between the second and third terminals 6 and 7, the cathode of the diode 13 being connected to the third terminal 7.
- the second diode 14 is connected between the first and fourth terminals 5 and 8, the cathode of the second diode 14 being connected to the first terminal 5.
- diodes 13 and 14 simplifies the structure of the control unit 3 and the control method of the switches.
- the diodes 13 and 14 may be of any suitable type. Diode-mounted MOS transistors are preferably used to facilitate the integration of the electronic control topology and to reduce the cost thereof.
- the detection assembly 4 comprises a current probe 15 mounted on a power line arranged between the fourth terminal 8 and the electrical control member 10. Of course, the current probe 15 could also be mounted between the third terminal 7 and the electrical control unit 10.
- the detection assembly 4 also comprises three comparators 16, 17 and 18, for example in the form of operational amplifiers, each having a first input connected to the output of the current probe 15 and an output connected to a specific input of the control unit 3.
- the second input of each comparator 16, 17, 18 is connected to a specific voltage reference 19, 20, 21, respectively, each providing a high level reference, low level and very low level, respectively.
- a control sequence of the actuator as a function of time between a shutter position d 0 of the injector and a setpoint position of injection.
- the needle can be moved initially from the shutter position to the injection setpoint position with a maximum amplitude, and then move alternately with a small amplitude of alt , and this, periodically.
- the needle can subsequently be returned to the closed position or maintained at the injection setpoint position. It can also be provided that the reciprocating movement does not immediately follow the movement towards the injection setpoint position and that the needle is maintained for a certain duration at the injection setpoint position.
- Such a sequence may correspond either to an injection sequence or to a sequence prior to the injection.
- the injection setpoint position it is possible for the injection setpoint position to be an open position of the needle in the case where the reciprocating displacement is used during the injection. It can also be provided that the injection setpoint position is a closed position and that the reciprocating movement with respect to the injection setpoint position is generated just before the opening of the needle.
- FIG. 3 illustrates the timing diagrams of various control signals applied by the control unit 3 and signals applied across the electrical control unit 10.
- the electrical control member 10 is electrically assimilated to an inductor.
- the continuous electrical source 9 applies a continuous potential.
- the voltage level applied to the gate of the transistors forming the switches 11 and 12 corresponds to their switching position.
- the switches 11 and 12 are open and the current in the electrical control member 10 is zero.
- the switch 11 is closed, its transistor being turned on. The current then begins to grow.
- the comparator 18 detects that the very low threshold is reached.
- the switch 12 is closed.
- the switches 11 and 12 remain closed and the comparator 17 detects that the low current threshold is reached. The current continues to grow substantially linearly.
- the comparator 16 detects that the high current threshold is reached.
- the control unit 3 controls the opening of the switch 11, which causes the conduction of the diode 13.
- the current in the electrical control member 10 decreases.
- the comparator 17 detects that the current has reached the threshold of low levels.
- the control unit 3 then controls the closing of the switch 11, which causes a growth of the current in the electrical control member 10 and the blocking of the diode 13.
- the last two phases can then be repeated a number of times.
- the order of end of control actuation occurs in a current decay phase in the electrical control member 10, the switch 11 is open and the switch 12 is closed.
- the control unit 3 controls the opening of the switch 12, which causes the conduction of the diode 14, the diode 13 is already in conduction.
- the current in the electrical control member 10 then decreases sharply.
- the comparator 17 detects the downward crossing of the low level threshold.
- the comparator 18 detects the downward crossing of the very low level threshold.
- state 1 The different states of the device are illustrated in FIG. 4.
- state 1 the switches 11 and 12 are open.
- the device goes to state 1 as soon as it is switched on. If an error is detected, the transition to state 5 is controlled. In state 1, switches 11 and 12 are closed. In the event of a stop, the device goes to state 4. In the event of an error, the device goes to state 5. If the crossing of the low threshold DSB is detected, the device switches to state 2. At state 2, switches 11 and 12 are closed. In the event of a stop, the device goes to state 4. In the event of an error, the device goes to state 5. If the high threshold DSH is detected, the device goes to state 3 In state 3, the switch 11 is open and the switch 12 is on. If the DSB low level threshold is detected, the device returns to state 2.
- the device In the event of a stop, the device goes to state 4. In case of error, the device switches to state 5. At state 4, switches 11 and 12 are open. In case of detection of crossing the low threshold very low DSTB, the device goes to state 0. In case of error, the device goes to state 5. In state 5, the switches 11 and 12 are open. The device returns to state 0 on receipt of an initialization signal. The detection of the very low threshold makes it possible to identify the moment when the current in the coil has canceled after the end of the on command of the device. It can thus be expected that the very low current threshold has been crossed to then restart the device. This avoids operating errors, which increases the reliability and robustness of the device.
- the invention makes it possible to precisely control the movement of the actuator, which makes it possible to better cut the jet of fuel in the case of an injector and to improve the fuel atomization during the injection.
- the bridge circuit 2 is identical to that of Figure 1, but the controls of switches 11 and 12 are reversed.
- the diode 14 is suppressed.
- the diode 13 is suppressed and the controls of the transistors 11 and 12 are reversed as in FIG. 14.
- the transistor 12 is replaced by a conductive connection or permanently maintained in the on state.
- the diode 14 is also suppressed.
- the switch 12 is replaced by a conductive connection or permanently maintained in the on state, the diodes 13 and 14 being present.
- FIG. 5 the bridge circuit is identical to that of Figure 1, but the controls of switches 11 and 12 are reversed.
- the diode 14 is suppressed.
- the diode 13 is suppressed and the controls of the transistors 11 and 12 are reversed as in FIG. 14.
- the transistor 12 is replaced by a conductive connection or permanently maintained in the on state.
- the diode 14 is also suppressed.
- the switch 12 is replaced by a conductive connection or permanently maintained in the on state, the di
- the controls of the transistors 11 and 12 are reversed and the transistor 12 is permanently maintained in the on state or replaced by an electric wire connected between the terminals 5 and 6.
- the Fig. 11 is close to that shown in Fig. 10, except that the diode 13 is removed and replaced.
- the bridge circuit 2 comprises three identical sub-assemblies 22, 23 and 24, each similar to the bridge circuit illustrated in FIG. 1. Three injectors can thus be controlled from the same electrical source.
- the three sub-assemblies 22 to 24 are devoid of diode 14.
- the subassemblies 22 and 23 are devoid of switch 12 replaced by an electric wire, while the subassembly 24 is well equipped with a switch 12.
- the subassemblies 22 to 24 have a common switch 12 and diode 13. There is no diode 14. Only the switch 11 is specific to each subassembly 22 to 24.
- the structure of the bridge arrangement can be simplified for the sake of economy, or on the contrary performed more completely for better control of the current and a limitation of overvoltages.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Selective Calling Equipment (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Lock And Its Accessories (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0411008A FR2876742B1 (fr) | 2004-10-18 | 2004-10-18 | Procede de pilotage d'un circuit de commande et dispositif d'actionnement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1647693A1 true EP1647693A1 (de) | 2006-04-19 |
EP1647693B1 EP1647693B1 (de) | 2009-12-16 |
Family
ID=34949947
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05300831A Not-in-force EP1647693B1 (de) | 2004-10-18 | 2005-10-18 | Verfahren zur Ansteuerung einer Steuerschaltung und Betätigungseinrichtung |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1647693B1 (de) |
AT (1) | ATE452284T1 (de) |
DE (1) | DE602005018304D1 (de) |
FR (1) | FR2876742B1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2958097A1 (fr) * | 2010-03-29 | 2011-09-30 | Valeo Sys Controle Moteur Sas | Circuit de controle du courant dans un organe electrique de commande ou de la tension aux bornes dudit organe electrique de commande |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2801346A1 (fr) | 1999-11-19 | 2001-05-25 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
US6577488B1 (en) * | 2000-01-14 | 2003-06-10 | Motorola, Inc. | Inductive load driver utilizing energy recovery |
US20040016461A1 (en) * | 2002-07-26 | 2004-01-29 | Wenmin Qu | System for determining positions of a control element of an electrically driven actuator |
FR2846808A1 (fr) | 2002-11-04 | 2004-05-07 | Renault Sa | Dispositif d'actionnement muni d'une topologie electronique de pilotage |
-
2004
- 2004-10-18 FR FR0411008A patent/FR2876742B1/fr not_active Expired - Fee Related
-
2005
- 2005-10-18 DE DE602005018304T patent/DE602005018304D1/de active Active
- 2005-10-18 AT AT05300831T patent/ATE452284T1/de not_active IP Right Cessation
- 2005-10-18 EP EP05300831A patent/EP1647693B1/de not_active Not-in-force
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2801346A1 (fr) | 1999-11-19 | 2001-05-25 | Renault | Dispositif d'injection de carburant pour moteur a combustion interne |
US6577488B1 (en) * | 2000-01-14 | 2003-06-10 | Motorola, Inc. | Inductive load driver utilizing energy recovery |
US20040016461A1 (en) * | 2002-07-26 | 2004-01-29 | Wenmin Qu | System for determining positions of a control element of an electrically driven actuator |
FR2846808A1 (fr) | 2002-11-04 | 2004-05-07 | Renault Sa | Dispositif d'actionnement muni d'une topologie electronique de pilotage |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2958097A1 (fr) * | 2010-03-29 | 2011-09-30 | Valeo Sys Controle Moteur Sas | Circuit de controle du courant dans un organe electrique de commande ou de la tension aux bornes dudit organe electrique de commande |
WO2011121214A1 (fr) * | 2010-03-29 | 2011-10-06 | Valeo Systemes De Controle Moteur | Circuit de contrôle du courant dans un organe électrique de commande ou de la tension aux bornes dudit organe électrique de commande |
Also Published As
Publication number | Publication date |
---|---|
ATE452284T1 (de) | 2010-01-15 |
FR2876742A1 (fr) | 2006-04-21 |
EP1647693B1 (de) | 2009-12-16 |
FR2876742B1 (fr) | 2010-08-27 |
DE602005018304D1 (de) | 2010-01-28 |
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