FR2759809A1 - METHOD AND DEVICE FOR CONTROLLING AN ELECTROMAGNETIC CONSUMER - Google Patents

Abstract

Method for controlling an electromagnetic consumer of current, in particular a solenoid valve for controlling the injection of fuel into an internal combustion engine, the charge stored in an accumulation means at the start of the control being transferred to the consumer, characterized in that after a state in which there is no injection, the accumulation means is loaded before a first injection.

Description

STATE OF THE ART The invention relates to a method and a device

  used to control an electromagnetic consumer in part

  In particular, a solenoid valve used to control the injection of fuel into an internal combustion engine, the charge stored in an accumulation means at the start of the order being transferred to the consumer. We know from document DE-OS 44 13 240 a

  device used to control an electromagnetic consumer

  current tick. In the case of this device, the energy which becomes free when disconnected is stored in a booster capacitor. At the start of the next command

  the stored energy is discharged into the consumer device

current tester.

  There are also known devices in which during the night period after the actual control of the valve an additional charge is placed in the capacitor

  by a brief connection and disconnection of the current. This pro-

  cessus is usually referred to as a maintenance charge or

  recharge. Recharge time should be as short as pos-

  sible because the time available, especially in the

  in case of high rotational speeds, can be very short.

  After connecting the control unit to

  by means of an ignition switch the capacitor as a rule

  is not loaded. If the internal combustion engine

  stays in operation long enough, without it

  injection duise, as for example in forced inertia operation, the capacitor is then as a rule also discharged. During a subsequent order, it may occur that the valve does not open or that it does not

opens only with delay.

  Object of the invention The basis of the invention relates in the case

  a device used to control an electronic consumer

  magnetic current even during the first order after a state in which there was no injection, to obtain a fast and precise process of connection of the electromagnetic consumer. Advantages of the invention The device according to the invention is characterized in that after a state in which there is no injection,

  the accumulation means are loaded before a first injection.

  The device according to the invention thus has the advantage that it is possible to have, even during the first

  dosing after a state in which there was no injection, rapid connection of the valve and exact dosing of the car-10 burant.

  According to other features of the invention: * the accumulation means is charged when there is a signal which indicates an imminent start-up process; * a speed signal is used as a signal which indicates an imminent start-up process;

  * one uses as signal which indicates a process of

  imminent breakdown, the voltage applied to a terminal 50; * the storage medium is loaded when there is a signal

  which indicates the end of a vehicle walk in inertia

  cée; * we use as signal which indicates the end of a walk

  of the vehicle in forced inertia, a signal provided by the po-

  sition of the accelerator pedal;

  * an electromagnetic consumer of current, in particular

  link a solenoid valve used to control the injection of fuel into an internal combustion engine, the load stored in an accumulation means at the start of the order being transferred to the consumer, means are provided for charging the storage means before a first injection, after a state, in which there are no injections. Drawings

  The invention will be described below in more detail.

  tail from several embodiments, shown

  ted on the accompanying drawings, in which:

  * Figure 1 shows a circuit of the device according to the invention-

  tion, Figures 2 and 3 show different signals carried in

  function of time and Figures 4 and 5 show respective

  a functional diagram. Description of the exemplary embodiments

  The system according to the invention is preferably mounted

  in the case of internal combustion engines, in particular

  culier in the case of internal combustion engines with ignition

  ordered. In these motors electromagnetic valves are used

  wind to control the fuel dosage. These electro-

  magnetic are hereinafter referred to as

  consumers. The invention is not limited to this use.

  tion, it can be used in all cases where one needs an electromagnetic consumer quickly establishing a circuit. During application in the case of internal combustion engines, in particular in the case of engines with

  internal combustion with controlled ignition the instants of the

  the opening and closing of the solenoid valve fix the start of injection or the end of injection of fuel into the

cylinder.

  In FIG. 1, the elements es-

  sentials of the system according to the invention. In the case of the embodiment shown, it is an internal combustion engine with four cylinders. In this case, each consumer is associated with an injector and each injector is associated with an engine cylinder. In the case of fairly high rotational speeds of the internal combustion engine there is

  instead of providing for several valves, interrup-

tores and diodes.

  Four, 100, 101, 102 and 103 have been designated

  summers. Respectively a first connection of the con-

  summers 100 to 103 is linked through a

  switch 115 and a diode 110 with a voltage source

power supply 105.

  Diode 110 is arranged so that it

  is linked by its anode with the plus pole and by its

  method with switch 115. In the case of the switch

  it is preferably a field effect transistor.

  Respectively the second connection of the consum-

  mateurs 100 to 103 is linked by means of a second switch 120, 121, 122 and 123 respectively with a resistor

  125. In the case of switch 120 to 123 it is also

  preferably field effect transistors. The switches 120 to 123 are designated as low-edge switches and the switch 115 as a

  high edge switch. The second connection of the resistance

  tance 125 is in connection with the second connection of the

supply voltage source.

  Each consumer 100 to 103 is associated with a diode 130, 131, 132 and 133. The connection of the anodes of the diodes is in contact respectively with the connection point

  between the consumer and the low-edge switch. The rac-

  cathode stringing is connected to a capacitor

  as well as with another switch 140. The second rac-

  switch 140 is in contact with the pre-

  better connections of consumers 100 to 103. In the case of switch 140 it is also preferably a field effect transistor. This switch 140 is also designated as a booster switch. The second connection of the capacitor 145 is also in connection with the second

  connection of the supply voltage source 105.

  A control unit 160 supplies the high edge switch 115 with a control signal AH. The switch is supplied by the control unit 160 with a signal

  AL1, switch 121 with a com-

  command AL2, switch 122 with a control signal AL3,

  switch 123 with a control signal AL4 and the inter-

  switch 140 with an AC control signal.

  Between the second connection of the power source

  voltage rating 105 and the connection point between the

  switch 115 and the first consumer connections 100 to 103, a diode 150 was connected. In this case the anode of the diode is connected to the second connection

  from the supply voltage source 105.

  The control retreats inter alia the signal N of a speed sensor 180, of a sensor 195

  indicating the position of the accelerator pedal, and the

  sion 190 applied to a terminal 50. On what is called the

  terminal 50 a voltage is applied when the starter is activated

  tionné. A voltage at terminal 50 indicates an actuation of the starter or an imminent start of the internal combustion engine. By means of resistor 125 it is possible to determine

  the intensity that passes through the consumer.

  With the arrangement shown it is only possible to measure the intensity by means of the intensity measurement resistor 125, when one of the switches 120 to

  123 is closed. To be able to also determine the intensity when the low-edge switches are open, you can set

  Also check the resistance for measuring the intensity in other places. For example the second connection of the condensa-

  tor 145 can be connected to the connection point which is between the intensity measurement means 125 and the switch at 123. In this case it is also possible to carry out a measurement of the intensity when the switch at bottom edge is closed. In addition, the intensity measurement means can be

  disposed between the voltage supply source and the

  high edge switch or between the high edge switch and

consumers.

  In Figure 2a we carried the control signal

  AC for the booster transistor 140. In FIG. 2b we have

  the control signal AH for the high edge switch 115. FIG. 2c shows the control signal AL from one of the

  low edge switches. In Figure 2d we have shown the

  tensity I which passes through the consumer and on the fi-

  gure 2e the voltage UC which is applied to capacitor 145

  as a function of time. In this case, a com-

  demand which corresponds to a dosing cycle, without injection

prerequisite for a solenoid valve.

  Different phases are differentiated during each dosing cycle. In phase 0, before ordering the

  consumer the final stage is disconnected. The signals of com-

  demand AC, AH and AL are at a rather low potential. This

  means that the high board switch 115, the interrup-

  low edge sensors 120 to 123 and the 140 booster switch

  the flow of current. It does not pass current through the consumer. The capacitor 145 is charged at its

maximum voltage UC.

  This takes for example a value of around volts, while on the other hand the supply voltage

  takes a value of about 12 volts.

  In the first phase at the start of the order,

  which is designated as a booster operation, the inter-

  the low-side switch which is ordered is the one associated with the consumer who must dose the fuel. This means

  that from phase 1 the signal AL takes a high level.

  At the same time, a high signal is delivered on the AC line which controls the switch 140. The high-edge switch 115 is not controlled, it continues to block. This

  control of the connection means has the effect of making

  ser a current from the capacitor 145 via the booster switch 140, the corresponding consumer, the low-edge switch associated with the consumer and the intensity measurement means 125. In this phase the intensity I increases very quickly due to the high voltage applied to the consumer. Phase 1 ends when the voltage

  applied to capacitor 145 falls below a value

their determined U2.

  In the second phase, also designated as regu-

  lation of the initial starting current the branch current-

  this is assumed by the high edge switch 115 and the

  booster is inactive. In the second phase the com-

  request for the booster switch 140 is resumed, so

  so that the switch 140 goes into the locked position.

  The control signals AH and AL for the high edge switch 115 and the low edge switch associated with the consumer

  are set to a high level, so that these switches li-

  bere flow current. In this way a current flows back from the voltage supply source

  via the diode 110, the high-edge switch 115, the

  summator, the corresponding low-edge switch, the resistance

  intensity measurement 125 towards the voltage source 105. By contacting the high-edge switch, the intensity which

  is detected by means of the measuring resistance of the current

  125, can be set to a value that can be set

  set beforehand for the initial starting current IA.

  This means that when the setpoint intensity IA is reached by the initial starting current, the high-edge switch 115 is controlled so that it goes into the blocking position. Passing below another threshold

he and released again.

  When the high edge switch 115 is in the posi-

  blocking, there is a freewheeling circuit that acts. Current flows from the consumer through the on-board switch

  bottom, resistor 125 and freewheeling diode 150.

  The second phase ends when the control unit

  Mande 160 delivers the end of the start-up phase. This can for example be the case when a detection device of

  the instant of connection detects that the armature of the electro-

  valve has reached its new position. If the detecting body

  tion of the connection time did not detect at

  within a predefined time that the armature of the electro-

  valve has reached its new position, we conclude that there is

failure.

  During the third phase, which is also designated as the first rapid extinction, the control signal from the corresponding low-edge switch is taken over. This has

  the effect of passing a current from the consumption

  corresponding counterpart through the diode 130 to 133 which is associated

  ciée to the consumer, in the capacitor 145 and to pass the energy stored in the consumer in the capacitor 145. The high board switch 115 is in this

  case ordered in the first embodiment shown

  ted in such a way that it remains closed. In this phase

  the intensity of the starting current IA drops to the intensity

  IH holding tee. At the same time the voltage which is applied to the capacitor 145 increases to a value U3 which is however clearly below the value U1. The third phase is completed when the setpoint IH of the holding current is reached. The energy that is released when switching from the starting intensity IA to

  the holding current IH is stored in the capacitor. It is particularly advantageous, in this case, that the transition from the starting intensity to the holding intensity5 takes place quickly due to the rapid extinction.

  The third phase is followed by the fourth phase which is also referred to as the regulation phase of

  maintenance intensity. Correspondingly, as in the second phase, the control signal for the low-edge switch 10 remains at its high level, that is to say that the low-edge switch, associated with the consumer, remains closed.

  me. By opening and closing the high-edge switch 115, the intensity which passes through the consumer is adjusted to the setpoint for the holding current. When the high edge switch 115 is in the blocking position a freewheeling circuit acts. The intensity passes from the consumer through the low-edge switch, the resistor 125 and the freewheeling diode 150. Phase 4 is complete when the

  injection process is complete.20 During the next fifth phase, also known as the second rapid extinction, we disconnect

  che the corresponding low-edge switch and the switch 115 with high edge is controlled so that it is on. Without this case the intensity which passes through the consumer also drops quickly to zero. At the same time the trend

  Zion which is applied on the capacitor 145, increases

  of a smaller value, than in the third phase.

  In phases 3 and 5 the setpoint of

  the intensity I goes from a high value to a low value.

  In these phases the low edge switch which is associated with the consumer is respectively controlled in such a way

  that it blocks the flow of current. The energy that becomes li-

  bre is in this case transferred to capacitor 145. During these phases, rapid extinction takes place. This means that

  the intensity quickly reached its new value of consi-

gne.

  During phases two and four a regulation takes place

  tion of the intensity by contact of the high-edge switch. When the high-edge switch is in the locked position, the freewheeling diode 150 is active. During these

  phases the intensity decreases slowly. This leads to a

lower switching frequency.

  During the sixth phase, the final stage is inac-

  tif, i.e. there is no fuel metering. This-

  ci means that the control signal AC from the booster switch 140, the control signal AH for the high-edge switch and the control signal AL for the switch

  bottom edge all take a low level and that all the inter-

  switches go into blocking position. The intensity that passes through the consumer remains at zero and the tension

  on capacitor 145 keeps its value.

  During the seventh phase after the order,

  phase which is also designated as night contact, the inter-

  high edge breaker 115 is set again by the signal

  AH control in its on position. By closing an

  breaker with low edge we initialize a current flow in one of the consumers. The current returns for example through the diode 110, the switch 115, the consumer 100, the connection means 120 and the intensity measurement means 125,

  at the voltage source. When the intensity has reached a value

  their set point which is chosen so that the elect

  valve does not react yet, the low edge switch is operated so that it opens. This causes her

  round a rapid extinction of the journey consisting of the consumption

  one of the diodes 130 to 133 and the capacitor 145.

  In this way the voltage applied to the capacitor 145 increases

  lie. As soon as the intensity falls below a value

  determined, the low edge switch 120 is activated again

  vé. This process is repeated until the voltage on the capacitor 145 has again reached the value step by step

  Ul. This process is referred to as refill.

  Then takes place phase 8, during which

  all control signals are taken over and all inter-

  switches are put in their blocking position. This phase

corresponds to phase 0.

  When consumers first order, after an internal combustion engine condition, in which it

  there are no injections, the capacitor is discharged. In this case, the 5 advantages of the capacitor cannot be used during the first order. In particular, there is no accelerated connection process and no defined injection.

  In addition, when starting the internal combustion engine, the voltage available drops below the usual value.10 To solve this problem, it is expected that after a state in which there are no injections, the means used to store energy is loaded before the first renewed injection. By using appropriate signals we

  detects an imminent injection and the process of charging the capacitor is introduced.

  One such state, in which there are no injections, is the stopping of the internal combustion engine. The trial-

  Overload is initialized when there is a signal indicating an imminent start-up process. As a signal, indicating the end of operation of the internal combustion engine in thrust, it is possible to use, for example, a position signal of the accelerator pedal. To detect an imminent start of the internal combustion engine, the output signal from the speed sensor and / or terminal 50 is used according to the invention. If the driver actuates the ignition key to start the combustion engine internal, the starter is supplied with current, in this case a voltage is applied to

  terminal 50. If the system detects that this voltage is

  the charging process starts. The exploitation of

  applying a voltage to terminal 15 is less appropriate

  required, because there is already a voltage applied to it, when we have only turned the ignition key. In this case the case may happen that the driver has only

  turn the ignition key and the combustion engine

  dull does not start until a later time.

  It is particularly advantageous that the process

  overload starts when the first pulse occurs

  The speed sensor. As a sensor

  the speed of rotation is generally used with a segment sensor and / or an incremental sensor which deliver pulses at regular intervals. In addition to these 5 signals, other signals can also be used to detect an imminent start.

  FIG. 3 shows different signals as a function of time. In partial figure 3a we have worn the

  voltage at terminal 15 and in partial figure 3b the voltage at terminal 50. Partial figure 3c shows the pulses

  sions of the rotational speed sensor 180. In FIG. 3d, the voltage U is plotted on the capacitor 145 and on the

  partial figure 3rd the intensity I which passes through the con-

summing.

  In Figure 3 there is shown the conditions prevailing during connection before the first injection.

  At time t0 the driver turns the ignition key and applies the voltage to terminal 15. At time tl the starter remains supplied with current, this corresponds to a rise in voltage at the terminal 50.

  Immediately after instant tl the first pulse of the speed-of-rotation sensor N. occurs. At this time tl or when the first speed-of-rotation pulse N occurs, the charge of capacitor 145, depending

  the invention begins. This means that from this ins-

  as long as it is done in the way that is shown in the

phase 7 of figure 2.

  This has the consequence that until time t2 the intensity increases and falls and that the voltage U rises step by step to the value U1. If this value is reached at time t2, the capacitor 145 is then fully charged. This state corresponds to the state of the capacitor after an injection according to the sequence of phase 7 in FIG. 2. At time t3 follows the first injection in the

  internal combustion engine which lasts until time t4.

  Between time t3 and time t4, phases 1 to 5 take place. Then comes a renewed charging process, to recharge the capacitor again. During each injection

  the time period will elapse as in Figure 2.

  FIG. 4 shows the operating mode

  operation from a functional diagram. During a first sequence 400, it is detected whether the voltage has risen on

  terminal 15. By the interrogation 410 which follows, we know

  test if there is a voltage applied to terminal 50.

  If this is not the case, we go to interrogation 420 by

  which one checks if there is a speed pulse

  tation. If this is also not the case, then the interrogation 410 is renewed. If a voltage is applied to terminal 50 and / or if the speed of rotation signal N exists, the charging process then follows the sequence 430 for the capacitor, as shown

* in Figure 3 from time tl.

  The two interrogations can both take place as shown. But we can also predict that

  to carry out one of the two interrogations.

  It is particularly advantageous to check what is called terminal 15. A voltage is applied to this terminal when the conductor turns the ignition key. It is advantageous in this case that the recharging process takes place during the exploitation of the voltage at terminal 15 before actuation of the starter, the supply voltage in

  this case being generally higher than after the action-

  starter. In the case of this form of realization

  The sequence 430 takes place directly after the sequence 400. Another embodiment has been shown.

  in Figure 5. During a first sequence 500 we de-

  tect if there is a functioning state during which there is no injection. Such an operating state occurs for example in the case of a vehicle running in forced inertia. Forced inertia is detected by exploiting the signals provided by the accelerator pedal and / or the speed of rotation. By question 510 which

  follows we check if the accelerator pedal is action-

  born. Pressing the accelerator pedal indicates the

  end of forced inertia walking. If there is no action-

  acceleration pedal, then we proceed to

  calf at interrogation 510. If there is an actuation of the accelerator pedal then comes next during the sequence

  520 the charging process of the capacitor, as we have

  presented in Figure 3 from time tl.

Claims (5)

R E V E N D I C A T IONS   1) Method for controlling an electromagnetic current consumer, in particular a solenoid valve for controlling   der the injection of fuel into an internal combustion engine, the charge stored in an accumulation means at the start of the order being transferred to the consumer, characterized in that after a state, in which it doesn ' there is no injection, the accumulation means are loaded before a first injection. 10 2) Method according to claim 1, characterized in that the accumulation means is charged, when there is a signal   which indicates an imminent start-up process.   3) Method according to one of the preceding claims,   characterized in that a speed signal is used as the signal   which indicates an imminent start-up process.   4) Method according to one of the preceding claims, characterized in that   we use as a signal which indicates a starting process   imminent rage, the voltage applied to a terminal 50.    ) Method according to claim 1, characterized in that the storage means is loaded when there is a signal which   indicates the end of a vehicle run in forced inertia.   6) Method according to claim 5, characterized in that one uses as signal which indicates the end of a march of the vehicle in forced inertia, a signal   provided by the position of the accelerator pedal.   7) Method for controlling an electromagnetic consumer   current, in particular a solenoid valve used to control   injection of fuel into an internal combustion engine   dull, the charge stored in an accumulation means at the start of the order being transferred to the consumer, characterized in that means are provided for charging the storage means before a first injection, after a state in which it there are no injections.