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WO1988007130A1 - Circuit numerise hybridable regulateur de courants positifs et negatifs de commande - Google Patents

Circuit numerise hybridable regulateur de courants positifs et negatifs de commande Download PDF

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Publication number
WO1988007130A1
WO1988007130A1 PCT/DE1988/000107 DE8800107W WO8807130A1 WO 1988007130 A1 WO1988007130 A1 WO 1988007130A1 DE 8800107 W DE8800107 W DE 8800107W WO 8807130 A1 WO8807130 A1 WO 8807130A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
current
digital
arrangement according
voltage
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.)
Ceased
Application number
PCT/DE1988/000107
Other languages
German (de)
English (en)
Inventor
Hermann Gässler
Klaus Harsch
Wolfgang Kosak
Rolf Reischl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of WO1988007130A1 publication Critical patent/WO1988007130A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/28—Interface 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current 
    • G05F1/46—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC
    • G05F1/56—Regulating voltage or current  wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
    • 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
    • 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

Definitions

  • the invention relates to a circuit arrangement for regulating positive and negative currents through an electromagnetic consumer with a series connection of at least one measuring resistor and the consumer.
  • a circuit arrangement is known, for example, from DE-OS 33 25 044 and is used in connection with internal combustion engines for current regulation by means of a direct current controller, for example a solenoid valve for metering fuel.
  • a direct current controller for example a solenoid valve for metering fuel.
  • a series connection of two or a bridge connection of four current control elements, in each case in series with the measuring resistor and the consumer is provided.
  • a P u lsd a uer / voltage voltage converter with an integrating device in which an operational amplifier is connected to a capacitance.
  • the output value of the integrating device can be set to a selectable initial value by bridging the integrating device.
  • the output value can be stored by means of a switching element.
  • a current control circuit which operates according to the "sample-and-hold" principle with capacitances is relatively slow and entails a not inconsiderable expenditure on software and hardware, namely for the timing, memory requirement and the generation of the control signals or for the capacities which are highly accurate ( Sample) and large (hold). For the latter reason, such circuits can also be practically not represented in an integrated design. Since they work analogously, they are also not compatible with computers.
  • the circuit arrangement according to the invention for controlling positive and negative currents through an electromagnetic consumer with a series connection of at least one measuring resistor and the consumer, in which a digital input stage is provided which has at least one digital / analog converter, has the particular advantage that due to the digita len mode of operation a very quick reaction of the circuit arrangement to changed operating conditions is achieved »The control is extremely simple because one command is sufficient. Large and precise capacities are no longer required, and therefore extensive integration or hybridization of the circuit can be carried out. With the circuit arrangement according to the invention, a high-precision two-quadrant current control with simultaneous suppression of interference signals by short settling times can be achieved.
  • two 4-bit digital / analog converters are provided; good resolution can be achieved with the eight bits.
  • the output signal of the converter is advantageously in one or each of an amplifier circuit converted into a proportional current signal. If the input stage is provided with a control circuit to which not only the (8-bit) input signals but also other digital control signals can be applied, the control by the software is particularly simple since all digital signals can be transferred in parallel.
  • a current control circuit downstream of the input stage with a current / voltage converter the inputs of which are supplied with the proportional current signal or a signal derived from a high-precision voltage source, preferably a bandgap reference source, and the output signal of which a voltage signal derived from the proportional current signal is connected receive particularly accurate voltage signal.
  • a bandgap reference the entire circuit arrangement can be implemented as a completely balanced output stage hybrid. This leads to increased operational safety and cost savings, since there is no need for testing and / or adjustment work in the control unit.
  • a switching circuit is connected to the control circuit, from which switching devices can be actuated in response to the digital control signals.
  • These each switch on a range signal from the high-precision voltage source or an associated range current path with the associated measuring resistor of the consumer.
  • a particularly high resolution in the range of one per thousand can be achieved with little effort.
  • These current sources can be switched to the consumer by means of further switching devices which can be actuated by the switching circuit and are arranged between current sources and the consumer; the current control is then switched off and the current through the consumer is determined only by these current sources.
  • the changeover switch can be acted upon by an emergency operation signal and, in response to this, switches off switching devices arranged in the respective areas.
  • protective circuits can also be provided in a simple manner, for example against short-circuiting of the consumer or excessive supply voltages. All of the embodiments described above can be integrated or hybridized.
  • FIG. 1 shows an advantageous embodiment of a circuit according to the invention
  • FIG. 2 shows its construction as a hybrid with an integrated circuit and external components.
  • the embodiment is a scarf Regulation of the current by an electromagnetic pressure actuator, which is arranged in a bypass line of a mechanical injection system of an internal combustion engine.
  • An electronic correction in mechanical injection can thus be achieved by influencing the control current for the pressure actuator. It is evident that this requires a high level of accuracy in terms of both resolution and reproducibility.
  • FIG. 1 shows a circuit arrangement which essentially has two parts, an input stage 10 and the actual current control circuit 40.
  • the current I S through a pressure regulator DS is to be controlled as a function of digital input information D0, D1, ..., D8, which are present with additional control information D8,, .., D11 at the input of the input stage.
  • the input stage 10 has a 12-bit latch 12 which is put into operation by means of an EN (enable) command.
  • the digital input signals D0, ..., D7 are transferred in parallel to two downstream digital / analog converters 14, 24.
  • Each of the converters 14, 24 is designed as a 4-bit converter and consequently the first four bits D0,..., D3 are applied to the digital / analog converter 14 and the second four bits D4 to the other digital / analog converter 24 , ..., D7 handed over.
  • the control information D8, ..., D11 is transferred via a line 22 to a changeover circuit 116, the function of which will be explained in more detail below.
  • An associated amplification circuit is connected downstream of each of the digital / analog converters 14 or 24, and zuar an amplifier circuit 16, 18, 20 for the converter 14 and an amplifier circuit 26, 28, 30 for the converter 24.
  • the output signal of the converter 14 is fed to one input (+) of an operational amplifier 16, the other input (-) with a terminal of a resistor 20 (1 kiloohm) and the emitter of an npn transistor 18 is connected.
  • the other terminal of resistor 20 is connected to ground.
  • the output of the digital / analog converter 24 is connected to one input (+) of an operational amplifier 26, the other input (-) of which is connected to a connection of a resistor 30 (16 kilohms), the other connection of which is connected to ground, and connected to the emitter of an NPN transistor 28.
  • the collectors of the transistors 18, 28 are connected to one another. A current of up to 1.70 mA can be emitted by the transistors 18, 28 on the collector side.
  • a reference current source in which a voltage source 32 leads to an input (-) of an operational amplifier 34, the other input (+) of which is connected to a voltage divider made up of resistors 36, 38 which is connected to a high-precision reference voltage source 52 is connected and is supplied by it with a reference voltage U R of 3.750 V.
  • the two reference sources 32 and 52 are designed as bandgap sources that do not require any adjustment per se, but the reference source 52 can be adjusted on the IC for drift optimization.
  • the reference voltage source 52 is also connected to a voltage divider composed of resistors 54, 56, 58, 60 and 62, of which the latter (62) can be trimmed.
  • the taps of the voltage divider lead to four connection points of a switch 46.
  • these connection points are designated (from top to bottom in FIG. 1) 3, 2, 1 and SAS and thus give three control ranges 3, 2 and 1 and a special area SAS (fuel cut-off), which are explained in more detail below.
  • the switch 46 that is to say its range selection, is controlled via the switching circuit 116, as indicated by an arrow correspondingly marked with (46), as a function of the digital control information D8,..., D11.
  • the collective tap of the switch 46 is connected to an input (+) of a current / voltage converter 42, the other input (-) of which is the amplified output signal (0 to 1.7 mA) of the analog / digital converter 14, 24.
  • This amplified signal therefore generates a voltage drop of up to 1.7 V at a resistor 44 connected to the input (-), the other terminal of which is connected to the output of the current / voltage converter 42, since the resistor 44 has a resistance value of 1 kilohm .
  • the corresponding range signal of the switch 46 is therefore connected to this 1.7 V.
  • the voltage U S is present as a control voltage at an input (+) of an operational amplifier 50 connected as a comparator, the other input (-) of which is connected to the collective tap of a switch 48, the individual taps 48.1, 48.2 and 48.3 of which are each connected to a measuring resistor stand RM1, RM2 or RM3 are connected. While switch 46 therefore uses its taps 46.1, 46.2 and 46.3 to select the reference voltage for the respective area 1, 2 and 3, switch 48 assigns the measuring resistor RM1, RM2 and RM3 associated with the respective area. The switches 46, 48 are therefore correspondingly controlled synchronously via the switching circuit 116, which is further indicated by the arrow marked (48).
  • the output of the comparator 50 is connected to the base of a transistor 64 (area 1), 74 (area 2) and 84 (area 3). Since the circles for areas 1, 2 and 3 essentially correspond to one another, only area 1 is discussed in detail below.
  • the collector of transistor 64 is connected to ground, the emitter is connected to a current source 94 and to the base of a further transistor 66 and to a connection of a switch 68, the other connection of which is connected to ground.
  • the switch 68 can be controlled by the switching circuit 116.
  • the collector of transistor 66 like the other connection of current source 94, is connected to a supply voltage U B.
  • the emitter of the transistor 66 is connected to the terminal 48.1 of the switch 48 and the measuring resistor RM1 for the area 1, which is connected in series with the consumer, the pressure regulator DS and consequently through which the current I S flows. Furthermore, the emitter of the transistor 66 is connected to a current source 70 which can be connected to ground via a switch 72 which can be actuated by the switching circuit 116.
  • Corresponding components are provided in the other two areas 2 and 3, namely transistors 74 and 84 corresponding to transistor 64 and transistor 66 corresponding to transistor 66 sistors 76 and 86.
  • area 1 is active and areas 2 and 3 are inactive. This results from the position of the switches 46 and 48, in which the taps 46.1 and 48.1 are switched through. Further, the switch 68 opens, transistor 66 would otherwise be blocked, and switch 72 is closed. By blocking the transistors 76, 86 as a result of the closed switches 78, 88, the regions 2 and 3 are switched off.
  • the pressure actuator DS is also connected to an input of an operational amplifier 106, at the other input of which the highly precise voltage UR is applied.
  • the output of the operational amplifier 106 is connected to the base of a transistor 108, the emitter of which is connected to ground and the collector of which is connected to the other connection of the pressure actuator DS.
  • the operational amplifier 50 with one of the power output stages 66, 76 or 86 (depending on the position of the switch 48), represents a voltage follower and therefore the voltage U S is established at the associated terminal X, Y or Z, provided the terminal current
  • the common connection of the measuring resistors RM1, RM2, RM3 and the pressure actuator DS is also connected to an input (+) of a comparator 104, the other input (-) of which is at 1.7 V.
  • the comparator 104 is used for short-circuit detection.
  • the comparator 104 switches off the current paths via the transistors 66, 76, 86 via its output, which is connected to the switches 68, 78, 88.
  • an overvoltage protection circuit 114 is shown schematically in FIG. 1, which outputs a corresponding output signal to the switching circuit 116 in the event of overvoltage conditions and causes the switching circuit 116 to switch off all analog functions (everything except 10, 16).
  • SAS overrun fuel cutoff
  • a certain current level is to be delivered to the pressure actuator DS, without being influenced by the input information DO, ..., D7.
  • the switch circuit 116 actuates several switches on the basis of a specific bit combination D8,..., D11, specifically switch 46 with tap 46.
  • SAS is switched through and switches 110 (current source 118) and 112 (current source 100) become switched simultaneously.
  • overrun cut-off I S less than or equal to -45 mA
  • in emergency operation I S between -1 mA and +1 mA.
  • the resolution corresponds to the LSB (least significant bit) of the 8-bit input signal.
  • the maximum control current in area 3 could be increased up to 140 mA.
  • an LSB corresponds to a current of 0.098 mA.
  • the extraordinarily high resolution that can be achieved with the circuit arrangement according to the invention can be seen from a comparison of the 0.098 with the 140 mA, namely this corresponds to a resolution in the range of 0.7 ° / oo, ie less than one per thousand.
  • FIG. 2 t schematic. how the circuit arrangement 10, 40 shown in FIG. 1 is largely integrated in an integrated circuit. Overall, a hybrio is obtained in which the integrated circuit with the three measuring resistors RM1, RM2 and RM3 and additional capacitors for protection and interference suppression purposes is switched off.
  • the terminal designations "A", "B" and so on in FIG. 2 correspond to the terminal designations of Ficiur 1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Automation & Control Theory (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

Un agencement de connexion utilisé pour régler des courants positifs et négatifs passant à travers un consommateur électromagnétique comprend au moins une résistance de mesure et connectée en série avec le consommateur et un étage numérique d'entrée ayant au moins un convertisseur numérique/analogique.
PCT/DE1988/000107 1987-03-07 1988-03-02 Circuit numerise hybridable regulateur de courants positifs et negatifs de commande Ceased WO1988007130A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873707442 DE3707442A1 (de) 1987-03-07 1987-03-07 Digitalisierte hybridisierbare stromregelschaltung fuer positive und negative steuerstroeme
DEP3707442.3 1987-03-07

Publications (1)

Publication Number Publication Date
WO1988007130A1 true WO1988007130A1 (fr) 1988-09-22

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ID=6322570

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Application Number Title Priority Date Filing Date
PCT/DE1988/000107 Ceased WO1988007130A1 (fr) 1987-03-07 1988-03-02 Circuit numerise hybridable regulateur de courants positifs et negatifs de commande

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DE (1) DE3707442A1 (fr)
WO (1) WO1988007130A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0756077A1 (fr) * 1995-07-25 1997-01-29 Ficht GmbH & Co. KG Circuit électronique de commande pour moteur à combustion interne

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109233A1 (de) * 1991-03-21 1992-09-24 Rexroth Mannesmann Gmbh Digitale ansteuerelektronik mit pulsweitenmoduliertem (pwm)-ausgangssignal zum ansteuern elektrischer stellglieder eines hydraulischen systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55161936A (en) * 1979-06-06 1980-12-16 Nippon Denso Co Ltd Control of engine running speed
DE3231937A1 (de) * 1982-08-27 1984-03-01 Atlas Fahrzeugtechnik GmbH, 5980 Werdohl Vergaser fuer einen ottomotor
DE3325044A1 (de) * 1983-07-12 1985-01-24 Robert Bosch Gmbh, 7000 Stuttgart Stromregler fuer einen elektromagnetischen verbraucher in verbindung mit brennkraftmaschinen
FR2565292A1 (fr) * 1984-06-02 1985-12-06 Bosch Gmbh Robert Dispositif pour commander et regler le courant passant par un recepteur electromagnetique en liaison avec un moteur a combustion interne

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55161936A (en) * 1979-06-06 1980-12-16 Nippon Denso Co Ltd Control of engine running speed
DE3231937A1 (de) * 1982-08-27 1984-03-01 Atlas Fahrzeugtechnik GmbH, 5980 Werdohl Vergaser fuer einen ottomotor
DE3325044A1 (de) * 1983-07-12 1985-01-24 Robert Bosch Gmbh, 7000 Stuttgart Stromregler fuer einen elektromagnetischen verbraucher in verbindung mit brennkraftmaschinen
FR2565292A1 (fr) * 1984-06-02 1985-12-06 Bosch Gmbh Robert Dispositif pour commander et regler le courant passant par un recepteur electromagnetique en liaison avec un moteur a combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 5, Nr. 37 (M-58)(709), 10. Marz 1981; & JP-A-55161936 (NIPPON DENSO K.K. 16. Dezember 1980 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0756077A1 (fr) * 1995-07-25 1997-01-29 Ficht GmbH & Co. KG Circuit électronique de commande pour moteur à combustion interne
US5687050A (en) * 1995-07-25 1997-11-11 Ficht Gmbh Electronic control circuit for an internal combustion engine

Also Published As

Publication number Publication date
DE3707442A1 (de) 1988-09-15

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