EP0377214B1 - Dispositif pour commander un courant électrique - Google Patents

Dispositif pour commander un courant électrique Download PDF

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Publication number
EP0377214B1
EP0377214B1 EP89124054A EP89124054A EP0377214B1 EP 0377214 B1 EP0377214 B1 EP 0377214B1 EP 89124054 A EP89124054 A EP 89124054A EP 89124054 A EP89124054 A EP 89124054A EP 0377214 B1 EP0377214 B1 EP 0377214B1
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EP
European Patent Office
Prior art keywords
current value
coil
current
time interval
signal
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.)
Expired - Lifetime
Application number
EP89124054A
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German (de)
English (en)
Other versions
EP0377214A1 (fr
Inventor
Thomas Eugene Boe
Vijay Manilal Dharia
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Deere and Co
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Deere and Co
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Publication date
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Publication of EP0377214A1 publication Critical patent/EP0377214A1/fr
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    • 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
    • H01F7/1844—Monitoring or fail-safe circuits
    • 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
    • F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching

Definitions

  • the invention relates to an arrangement for controlling an electrical current according to the preamble of claim 1.
  • Another known method for controlling the coil current uses a current feedback sensor connected in series with the coil.
  • the current is determined by a comparison device, which in turn moves the control unit back when the coil current exceeds a reference value and which drives the control unit back up when the coil current falls below the reference value.
  • a switch-insensitivity range can be set for the comparison circuit by means of controllable switch-off and switch-on times.
  • the valve actuation process provides precise control of the average coil current for both changing supply voltages and changing coil resistances.
  • the cost and number of electronic components required for this method can be considerably higher than for the pulse width modulation method. Consequently, it becomes inexpensive and effective arrangement for controlling the electromagnet current.
  • an amplifier circuit for electromagnets of proportional or servo valves with the generic features in which the input of a clocked pulse width modulator is connected to the output of a controller, the pulse width of which is determined by the output signal of the controller becomes.
  • the output signal of the pulse width modulator is fed to a control logic which drives transistors arranged in a bridge circuit.
  • the excitation winding of an electromagnet is located in a branch of the bridge circuit.
  • In other branches of the bridge circuit there are two resistors whose voltage drop is measured and used to generate the actual value for the current in the field winding. The difference between the actual current value and a current setpoint is formed at a summing point and fed to the controller as a control deviation.
  • EP-A-0 220 559 specifies a method for driving a magnetic coil which is periodically fed by direct current pulses. After a certain period of time, the coil current is reduced in order to reduce the thermal load on the magnet coil after lifting work has been carried out, if the magnet coil is only intended to ensure a holding function.
  • the object to be achieved with the invention is seen in specifying an arrangement of the type mentioned at the outset, which is simple in construction and inexpensive. Furthermore, the current control arrangement should be able to be developed in such a way that it can determine whether the magnet coil is in an open circuit and that it enables the interruption frequency to be set easily.
  • a microprocessor periodically generates a peak current setpoint and energizes the solenoid.
  • a voltage corresponding to the peak current set point is applied to an input of a comparator.
  • the actual coil current is sensed through a resistor in series with the coil and a voltage corresponding to the sensed coil current is applied to the other input of the comparator.
  • the comparison device generates an interrupt signal at its output as soon as the detected coil current reaches the peak current setpoint.
  • the interrupt signal is fed to the microprocessor, which emits control signals for separating the magnetic coil from the earth potential. If the microprocessor does not receive an interrupt signal, it lowers the peak current setpoint after a predeterminable time interval, whereupon a new comparison is made. If an interrupt signal is still not generated, the peak current setpoint is lowered again and a comparison is carried out again. If there is also no interruption signal, a signal is generated which indicates that the circuit in which the magnet coil is located is interrupted.
  • This peak current detection method provides proximity control for the coil current that regularly requires fewer parts than other known ones Methods of current compensation control. Since the interruption time is controlled by the software of the microprocessor, the interruption frequency can also be conveniently set. The number of parts is reduced because the interrogation resistance can be inserted into the switchable earth line of the coil and because no switch insensitivity range of the comparison device is required. Another advantage of this modulation control method is that a coil short-circuit has a self-limiting effect, since the average current of a pure ohmic load is much smaller than the peak current. Furthermore, software that can be used allows a broken circuit to be sensed by the absence of a peak current break.
  • valves 42a and 42b shown in FIGS. 1a and 1b are each driven by identical valve control circuits 512, each of which via a relay K501 with a +12 volt voltage source, via a D / A converter U203 with the microprocessor 508 and with one of the Microprocessor connections 6 and 7 and connected to a NAND gate U002.
  • valve control circuits 512 each of which via a relay K501 with a +12 volt voltage source, via a D / A converter U203 with the microprocessor 508 and with one of the Microprocessor connections 6 and 7 and connected to a NAND gate U002.
  • only one valve with a valve control circuit is required for the application of the present invention, it being possible to dispense with the NAND gate U002 shown.
  • only one of the two valves 42a and 42b is activated.
  • the block diagram according to FIG. 1a and the valve control circuit according to FIG. 1b contain the following components:
  • the microprocessor 508 In cooperation with the valve drive circuit shown in Figures 1a and 1b, the microprocessor 508 periodically executes valve drive program sequences (see Figures 2a and 2b) which respond as follows: A reference value for the peak valve current VCOM is sent to the minus input via the D / A converter U203 of the comparator U004. Microprocessor 508 also generates a signal that is present at terminals 6 or 7 and turns on transistor Q601 so that current flows through the solenoid of valve 42a or 42b. When the solenoid current sensed through resistor R601 reaches a value that corresponds to the peak value VCOM, the output of comparator U004 switches from one position to another, thereby providing an interrupt signal to terminal 12 of microprocessor 508.
  • This interrupt signal triggers the program run (Steps 100 to 106) for the peak current detection, which is shown in FIGS. 2a and 2b and begins with the input step 100.
  • This program then generates a signal in step 102 which opens the transistor Q601, whereby the current to the magnet coil is interrupted for a predeterminable period of time, which is predetermined by steps 104 to 116.
  • Microprocessor 508 also detects whether the solenoid is in an open circuit or not. This is done by lowering the reference value for the peak valve current twice, provided that no interruption signal is received within a certain time interval. If the queried valve current does not reach the twice reduced reference current value and no interruption has yet been received within an additional time interval, a signal is generated which indicates the open circuit. These steps are carried out with the time program (steps 120 to 156), which is shown in FIGS. 3a to 3c.
  • the time program is started with step 120 by a trigger signal every 80 microseconds. It is then determined in step 122 whether both valves are de-energized. If this is the case, the algorithm proceeds to step 130, otherwise it proceeds to step 124. In 124 it is determined whether an off time interval is currently in progress. If so, the algorithm proceeds to step 126. If not, the algorithm proceeds to step 132. If there is an off time interval, the value of the off timer is gradually reduced in step 126 and it is determined in each case whether the timeout has expired. If not, the algorithm proceeds to step 134, otherwise it proceeds to step 128. Step 128 emits a signal which indicates that no off-time interval is active and switches the corresponding valve on.
  • step 130 it is indicated that the peak current interruption is no longer present, an open circuit timer is activated again and it is indicated that there is no current limitation.
  • the open circuit timer has a duration of 0.6 seconds. If no interrupt signal is generated within this time, this means that the coil is in an interrupted circuit.
  • Step 132 indicates that no peak current interruption has occurred.
  • Step 134 counts down the timer of the main program loop and emits a signal when the time interval of the timer has expired.
  • the main program timer has a duration of 10 seconds.
  • step 136 it is checked in step 136 whether the algorithm is waiting for a peak current interrupt. If not, the algorithm continues in step 152. Otherwise, the algorithm proceeds to step 138, in which the query is "is this an end of the circuit test?". If so, the algorithm proceeds to step 152 again. If not, go to step 140.
  • Step 140 counts down an open circuit timer and determines if its time has expired. If not, the algorithm continues to step 152; if the time has expired, proceed
  • step 142 the current limit value is checked and, depending on this value, the program is continued with one of the steps 144, 146 or 148. If, for example, the current limit is zero, which means that there is no current limit, the program continues with step 144, which sets the current limit to the maximum value. If, according to step 142, the current limit value is equal to the maximum limit value, the program continues with step 146, where the current limit value is reduced to a lower value. If, according to step 142, the current limit value is equal to the lower limit value, this becomes The program proceeds to step 148, where an error signal is set which indicates that a faulty open circuit has occurred. In this case, the valve drive is switched off by opening the relay K501 and the current limit value is reset to zero.
  • step 150 the timer for the open circuit is reactivated in step 150.
  • steps 152 and 154 other timers are reset or reactivated depending on the present case.
  • the peak current level can be set (using a digital / analog converter U203) and markers can be set which indicate to the timer program which valve is switched on.
  • This valve program also controls the length of the time interval (delay) during which the valves are switched off.
  • G80 and G81 are predeterminable constants and VCOM is the peak current setpoint.

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  • 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)
  • Magnetically Actuated Valves (AREA)
  • Feedback Control In General (AREA)

Claims (4)

  1. Dispositif pour commander un courant électrique qui est appliqué périodiquement à la bobine d'un électroaimant, comprenant des moyens pour enregistrer une valeur effective de courant qui correspond à la valeur actuelle du courant de la bobine, des moyens pour produire une valeur de courant de référence, des moyens pour comparer la valeur effective de courant et la valeur de courant de référence et produire un premier signal lorsque la valeur effective de courant atteint la valeur de courant de référence, et des moyens qui interrompent périodiquement le courant de bobine en fonction du premier signal,
    caractérisé en ce que la valeur de courant de référence correspond à une valeur de consigne souhaitée de courant de pointe de la bobine et en ce que sont prévus des moyens qui réduisent la valeur de courant de référence dans la mesure où aucun premier signal n'a été produit au cours d'un intervalle de temps déterminé.
  2. Dispositif selon la revendication 1, caractérisé par des moyens pour produire un second signal dans la mesure où la valeur effective de courant n'atteint pas la valeur réduite de courant de référence au cours d'un intervalle de temps prédéterminable.
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que sont prévus des moyens qui provoquent une nouvelle excitation de la bobine au cours d'un intervalle de temps prédéterminable à la suite de l'interruption du courant de la bobine, cet intervalle de temps prédéterminable diminuant avec l'augmentation de la valeur de courant de référence.
  4. Dispositif selon la revendication 3, caractérisé en ce que la longueur de l'intervalle de temps DELAY, pendant lequel le courant de la bobine est interrompu, est tirée de l'équation suivante :

    DELAY = G80 - VCOM x G81/256,
    Figure imgb0004

    G80 et G81 étant des constantes prédéterminables selon le dispositif et VCOM étant la valeur de consigne de courant de pointe de la bobine.
EP89124054A 1989-01-06 1989-12-28 Dispositif pour commander un courant électrique Expired - Lifetime EP0377214B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/294,527 US4964014A (en) 1989-01-06 1989-01-06 Solenoid valve driver
US294527 1989-01-06

Publications (2)

Publication Number Publication Date
EP0377214A1 EP0377214A1 (fr) 1990-07-11
EP0377214B1 true EP0377214B1 (fr) 1993-04-28

Family

ID=23133827

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Application Number Title Priority Date Filing Date
EP89124054A Expired - Lifetime EP0377214B1 (fr) 1989-01-06 1989-12-28 Dispositif pour commander un courant électrique

Country Status (4)

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US (1) US4964014A (fr)
EP (1) EP0377214B1 (fr)
CA (1) CA2002433C (fr)
DE (1) DE58904211D1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2269950A (en) * 1992-08-22 1994-02-23 Rover Group Fuel injector controller with fault monitoring
US5438489A (en) * 1993-09-30 1995-08-01 Judy; Steven W. Solenoid driver circuit and diagnostics
IT1281587B1 (it) * 1996-01-03 1998-02-20 Italcementi Spa Composizione superfluidificante per composizioni cementizie
US5748431A (en) * 1996-10-16 1998-05-05 Deere & Company Solenoid driver circuit
US6111514A (en) * 1996-12-18 2000-08-29 Kelsey-Hayes Company Solenoid fail-safe using current feedback as a diagnostic input
US5918195A (en) * 1997-05-08 1999-06-29 Case Corporation Calibration of a command device in control system
US6256185B1 (en) 1999-07-30 2001-07-03 Trombetta, Llc Low voltage direct control universal pulse width modulation module
US6407902B1 (en) * 2000-02-29 2002-06-18 Dietrich Industries, Inc. Control system for a solenoid valve driver used to drive a valve of a compression cylinder
UA93051C2 (uk) * 2005-07-29 2011-01-10 Грако Міннесота Інк. Спосіб керування поршневим пневматичним насосом (варіанти)
US20150369145A1 (en) * 2015-08-28 2015-12-24 Caterpillar Inc. Method of operating current controlled driver module
US11346311B2 (en) * 2015-11-30 2022-05-31 Denso Corporation Fuel injection control device for internal combustion engine

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0220559A1 (fr) * 1985-10-10 1987-05-06 Honeywell Inc. Procédé pour commander un solénoide électromagnétique entraîné par courant direct et circuit de contrôle pour exécuter ledit procédé

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DE2916322A1 (de) * 1979-04-23 1980-11-13 Vdo Schindling Verfahren und vorrichtung zum schutz eines insbesondere mit einem halbleiterelement aufgebauten, durch ein einschaltsignal einschaltbaren schaltglieds gegen ueberlastung bei kurzschluss
DE3322006A1 (de) * 1983-06-18 1984-12-20 Robert Bosch Gmbh, 7000 Stuttgart Vorrichtung zur steuerung eines induktiven stellgliedes, insbesondere eines vergasers
FR2548840B1 (fr) * 1983-07-08 1986-07-18 Peugeot Commutateur disjoncteur statique
DE3338764A1 (de) * 1983-10-26 1985-05-09 Robert Bosch Gmbh, 7000 Stuttgart Schaltungsanordnung zum ein- und ausschalten und ueberwachen elektrischer verbraucher
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US4618908A (en) * 1985-08-05 1986-10-21 Motorola, Inc. Injector driver control unit with internal overvoltage protection
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Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220559A1 (fr) * 1985-10-10 1987-05-06 Honeywell Inc. Procédé pour commander un solénoide électromagnétique entraîné par courant direct et circuit de contrôle pour exécuter ledit procédé

Also Published As

Publication number Publication date
US4964014A (en) 1990-10-16
CA2002433C (fr) 1995-03-07
CA2002433A1 (fr) 1990-07-06
EP0377214A1 (fr) 1990-07-11
DE58904211D1 (de) 1993-06-03

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