EP0187926A2 - Electronic system to institute control values for a motor vehicle - Google Patents

Electronic system to institute control values for a motor vehicle Download PDF

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Publication number
EP0187926A2
EP0187926A2 EP85114944A EP85114944A EP0187926A2 EP 0187926 A2 EP0187926 A2 EP 0187926A2 EP 85114944 A EP85114944 A EP 85114944A EP 85114944 A EP85114944 A EP 85114944A EP 0187926 A2 EP0187926 A2 EP 0187926A2
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EP
European Patent Office
Prior art keywords
electronic system
data
correction
supply voltage
connection
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.)
Withdrawn
Application number
EP85114944A
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German (de)
French (fr)
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EP0187926A3 (en
Inventor
Michael Horbelt
Rüdiger Jautelat
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0187926A2 publication Critical patent/EP0187926A2/en
Publication of EP0187926A3 publication Critical patent/EP0187926A3/en
Withdrawn legal-status Critical Current

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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
    • F02D41/30—Controlling fuel injection
    • F02D41/3005—Details not otherwise provided for
    • 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
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
    • F02D2200/503—Battery correction, i.e. corrections as a function of the state of the battery, its output or its type

Definitions

  • the invention is based on an electronic system for forming control variables in motor vehicles, in particular in connection with fuel metering, according to the preamble of the main claim.
  • a "device for regulating operating parameters of an internal combustion engine to optimum values" is known, which comprises a data processing system with a memory from which control data dependent on operating parameters can be read out.
  • the stored values can be adapted to the latest requirements so that the read values come as close as possible to optimal values.
  • the task expansion and application-friendliness of digital systems usually require an expansion of the data storage on the CPU (Central Processing Unit) by an external data storage.
  • CPU Central Processing Unit
  • One of the objects of the present invention is therefore to provide an electronic system for forming control variables in motor vehicles, in which it is ensured that only correct data are used for signal processing.
  • the electronic system according to the invention with the features of the main claim ensures, according to the task, that only data are used which were formed and stored when the system was operating properly.
  • FIG. 1 shows a rough overview diagram of a computer-controlled internal combustion engine control system
  • FIG. 2 shows a flow diagram with regard to the injection signal calculation.
  • FIG. 1 a computer-controlled system for an internal combustion engine is presented in a rough overview.
  • a microprocessor bears the reference numeral 10, 11 denotes the more or less independent input block and 12 the corresponding output block.
  • Memory modules have the reference numbers 13 and 14, 13 representing a ROM and 14 a RAM.
  • the input block 11 receives input signals relating to the data, such as speed and load, which are important for the control.
  • an injection valve 15 and a spark plug 16 are connected to block 12.
  • Their selection also documents only a partial aspect of the application of the invention. This is because the invention can be used wherever electronic systems for forming control variables are used in a motor vehicle and variables which can be called up in connection with signal processing can be changed. If the exemplary embodiment also relates to an internal combustion engine control system, the invention can also be used e.g. in principle also in connection with an anti-lock system or a transmission control.
  • FIG. 2 gives details of a flow chart for the formation of the corresponding quantities, incorporating the invention.
  • a block 21 follows with the calculation of input variables which are focused on the speed and load signals with regard to the injection signal generation.
  • a basic injection time te is read out from a memory depending on the number of patients and the load.
  • a correction 23 of the basic injection signal from block 22 the correction factor KKF being read out from an assigned correction map 24 and the new injection value resulting from the product of the basic injection value from block 22 multiplied by the map correction factor KKF.
  • An interrogation unit is identified by 27. It determines whether the possibly buffered supply voltage of the system or certain sub-areas e.g. reached the value of 12 volts or not. If this value is not reached, the end 28 of the program sequence follows immediately. In the other case, ie if the supply voltage UBatt has a sufficient value, the correction factor KKF of the block 24 is corrected in accordance with the latest requirements and thus the "learning" of the system is initiated (release of a learning algorithm and / or release of the storage) . This is done in block 29 with the value calculation of the correction factor KKF and the replacement of the original value (s) of this map with the latest data. After reading in the latest data - marked by a block 30 - the end 28 of the program again follows.
  • the injection system sketched with the flow diagram according to FIG. 2 thus calculates a basic injection signal from the most important input variables, which is then corrected by means of components having a multiplicative and additive effect.
  • One of these components - in the illustrated case a multiplicative one - is adapted to the latest requirements, so that corrections beyond this more or less correspond to a fine-tuning.
  • Query 27 now ensures that the calculation and / or exchange of the correction factors of block 24 takes place only when the operational readiness of the entire system or parts thereof is ensured.

Abstract

In the system, values which can be read out from a characteristic map can be corrected and the data for the correction are only formed and made available when the readiness for operation of at least part of the system has been ensured. This applies particularly with respect to the supply voltage of the elements concerned. The illustrative embodiment depicted in the flow diagram relates to the formation of injection signals via the formation of a basic signal with subsequent learnable correction, the correction data being updated and read into the corresponding memory only as long as the supply voltage has exceeded certain values. <IMAGE>

Description

Die Erfindung geht aus von einem elektronischen System zum Bilden von Steuergrößen bei Kraftfahrzeugen, insbesondere in Verbindung mit der Kraftstoffzumessung, nach der Gattung des Hauptanspruchs. Aus der DE-OS 28 47 021 ist eine "Vorrichtung zur Regelung von Betriebskenngrößen einer Brennkraftmaschine auf optimale Werte" bekannt, die eine Datenverarbeitungsanlage mit einem Speicher umfaßt, aus dem von Betriebskenngrößen abhängige Steuerdaten auslesbar sind. Mittels eines sogenannten lernenden Regelsystems lassen sich die gespeicherten Werte den jeweils neuesten Anforderungen anpassen, damit wiederum die ausgelesenen Werte optimalen Werten möglichst nahe kommen.The invention is based on an electronic system for forming control variables in motor vehicles, in particular in connection with fuel metering, according to the preamble of the main claim. From DE-OS 28 47 021 a "device for regulating operating parameters of an internal combustion engine to optimum values" is known, which comprises a data processing system with a memory from which control data dependent on operating parameters can be read out. Using a so-called learning control system, the stored values can be adapted to the latest requirements so that the read values come as close as possible to optimal values.

Die Aufgabenerweiterung und Applikationsfreundlichkeit von aigitalen Systemen erfordern zumeist eine Erweiterung des auf der CPU (Central Processing Unit) befindlichen Datenspeichers um einen externen Datenspeicher.The task expansion and application-friendliness of digital systems usually require an expansion of the data storage on the CPU (Central Processing Unit) by an external data storage.

Bei der Verwendung von diesen externen Datenspeichern ist im Betrieb bezüglich der'Funktionstüchtigkeit eine besondere Überwachung notwendig. Speziell in lernenden Systemen, die ihre Daten in diesem Speicherbaustein ablegen, um sie später wieder verwenden zu können, würde ein nicht erkannter Ausfall eine erhebliche Funktionsbeeinträchtigung zur Folge haben, eventuell zum Ausfall des gesamten Systems führen.When using these external data storage devices, special monitoring is required in terms of their functionality. Especially in learning systems that store their data in this memory module so that they can be used again later, an undetected failure would result in a significant functional impairment, possibly leading to the failure of the entire system.

Eine der Aufgaben der vorliegenden Erfindung ist es daher, ein elektronisches System zum Bilden von Steuergrößen bei Kraftfahrzeugen zu schaffen, bei dem sichergestellt ist, daß nur ordnungsgemäße Daten für die Signalverarbeitung verwendet werden.One of the objects of the present invention is therefore to provide an electronic system for forming control variables in motor vehicles, in which it is ensured that only correct data are used for signal processing.

Vorteile der ErfindungAdvantages of the invention

Das erfindungsgemäße elektronische System mit den Merkmalen des Hauptanspruchs stellt entsprechend der Aufgabenstellung sicher, daß nur Daten Verwendung finden, die bei ordnungsgemäßem Betrieb der Anlage gebildet, und abgespeichert wurden.The electronic system according to the invention with the features of the main claim ensures, according to the task, that only data are used which were formed and stored when the system was operating properly.

Weitere Vorteile der Erfindung sowie vorteilhafte Ausgestaltungen des erfindungsgemäßen elektronischen Systems ergeben sich in Verbindung mit den Unteransprüchen und der Beschreibung eines im folgenden behandelten Ausführungsbeispiels.Further advantages of the invention and advantageous refinements of the electronic system according to the invention result in connection with the subclaims and the description of an exemplary embodiment dealt with below.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Es zeigen Figur 1 ein grobes Übersichtsdiagramm eines rechnergesteuerten Brennkraftmaschinensteuerungssystems und Figur 2 ein Flußdiagramm bezüglich der Einspritzsignalberechnung.An embodiment of the invention is shown in the drawing. FIG. 1 shows a rough overview diagram of a computer-controlled internal combustion engine control system and FIG. 2 shows a flow diagram with regard to the injection signal calculation.

Beschreibung des AusführungsbeispielesDescription of the embodiment

In Figur 1 ist in grober Übersichtsdarstellung ein rechnergesteuertes System für eine Brennkraftmaschine vorgestellt. Ein Mikroprozessor trägt das Bezugszeichen 10, mit 11 ist der mehr oder weniger selbständige Eingangsblock und mit 12 der entsprechende Ausgangsblock bezeichnet.-Speicherbausteine haben die Bezugsziffern 13 und 14, wobei 13 ein ROM darstellt und 14 ein RAM. Der Eingangsblock 11 erhält ausgehend von nicht dargestellten Sensoren Eingangssignale bezüglich der Daten wie Drehzahl und Last, die für die Steuerung von Bedeutung sind. Ausgangsseitig sind am Block 12 ein Einspritzventil 15 sowie eine Zündkerze 16 angeschlossen. Auch ihre Auswahl dokumentiert lediglich einen Teilaspekt der Anwendung der Erfindung. Die Erfindung läßt sich nämlich überall dort anwenden, wo elektronische Systeme zum Bilden von Steuergrößen bei einem Kraftfahrzeug eingesetzt werden und im Zusammenhang mit der Signalverarbeitung abrufbare Größen änderbar sind. Wenn sich auch das Ausführungsbeispiel auf eine Brennkraftmaschinensteuerung bezieht, so läßt sich die Erfindung auch z.B. im Zusammenhang mit einem Blockierschutzsystem oder einer Getriebesteuerung grundsätzlich ebenfalls verwenden.In Figure 1, a computer-controlled system for an internal combustion engine is presented in a rough overview. A microprocessor bears the reference numeral 10, 11 denotes the more or less independent input block and 12 the corresponding output block. Memory modules have the reference numbers 13 and 14, 13 representing a ROM and 14 a RAM. Starting from sensors (not shown), the input block 11 receives input signals relating to the data, such as speed and load, which are important for the control. On the output side, an injection valve 15 and a spark plug 16 are connected to block 12. Their selection also documents only a partial aspect of the application of the invention. This is because the invention can be used wherever electronic systems for forming control variables are used in a motor vehicle and variables which can be called up in connection with signal processing can be changed. If the exemplary embodiment also relates to an internal combustion engine control system, the invention can also be used e.g. in principle also in connection with an anti-lock system or a transmission control.

Im Zusammenhang mit einem Einspritzsteuersystem nennt Figur 2 Einzelheiten eines Flußdiagramms zur Bildung der entsprechenden Größen unter Einbeziehung der Erfindung.In connection with an injection control system, FIG. 2 gives details of a flow chart for the formation of the corresponding quantities, incorporating the invention.

Das Flußdiagramm nach Figur 2 beginnt mit Start 20. Es folgt ein Block 21 mit der Berechnung von Eingangsgrößen, die bezüglich der Einspritzsignalerzeugung ihren Schwerpunkt beim Drehzahl- und Lastsignal haben. In einem folgenden Block 22 wird abhängig von Dr.ehzahl und Last eine Grundeinspritzzeit te aus einem Speicher ausgelesen. Es folgt eine Korrektur 23 des Grundeinspritzsignals von Block 22, wobei der Korrekturfaktor KKF aus einem zugeordneten Korrekturkennfeld 24 ausgelesen wird und der neue Einspritzwert sich aus dem Produkt des Grundeinspritzwerts von Block 22 multipliziert mit dem Kennfeldkorrekturfaktor KKF ergibt. Daran schließen sich in zwei weiteren Blöcken 25 und 26 multiplikativ wirkende Korrekturfaktoren KF sowie additiv wirkende Korrekturgrößen tadd an, die letztlich am Ausgang des Blocks 26 das auszugebende Einspritzsignal ergeben.The flowchart according to FIG. 2 begins at start 20. A block 21 follows with the calculation of input variables which are focused on the speed and load signals with regard to the injection signal generation. In a subsequent block 22, a basic injection time te is read out from a memory depending on the number of patients and the load. This is followed by a correction 23 of the basic injection signal from block 22, the correction factor KKF being read out from an assigned correction map 24 and the new injection value resulting from the product of the basic injection value from block 22 multiplied by the map correction factor KKF. This is followed in two further blocks 25 and 26 by multiplicative correction factors KF and additive correction quantities tadd, which ultimately produce the injection signal to be output at the output of block 26.

Eine Abfrageeinheit ist mit 27 gekennzeichnet. Sie ermittelt, ob die gegebenenfalls gepufferte Versorgungsspannung des Systems bzw. bestimmter Teilbereiche z.B. den Wert von 12 Volt erreicht oder nicht. Wird dieser Wert nicht erreicht, dann folgt unmittelbar das Ende 28 des Programmablaufs. Im anderen Falle, d.h., wenn die Versorgungsspannung UBatt einen ausreichenden Wert besitzt, wird der Korrekturfaktor KKF des Blocks 24 entsprechend den neuesten Erfordernissen korrigiert und somit das "Lernen" des Systems in die Wege geleitet (Freigabe eines Lernalgorythmus und/oder Freigabe der Speicherung). Dies erfolgt im Block 29 mit der Werteberechnung des korrekturfaktors KKF und dem Ersatz des oder der ursprünglichen Werte dieses Kennfeldes durch die neuesten Daten. Im Anschluß an das Einlesen der neuesten Daten - markiert durch einen Block 30 - schließt sich wiederum das Ende 28 des Programms an.An interrogation unit is identified by 27. It determines whether the possibly buffered supply voltage of the system or certain sub-areas e.g. reached the value of 12 volts or not. If this value is not reached, the end 28 of the program sequence follows immediately. In the other case, ie if the supply voltage UBatt has a sufficient value, the correction factor KKF of the block 24 is corrected in accordance with the latest requirements and thus the "learning" of the system is initiated (release of a learning algorithm and / or release of the storage) . This is done in block 29 with the value calculation of the correction factor KKF and the replacement of the original value (s) of this map with the latest data. After reading in the latest data - marked by a block 30 - the end 28 of the program again follows.

Das mit dem Flußdiagramm nach Figur 2 skizzierte Einspritzsystem berechnet somit aus den wichtigsten Eingangsgrößen ein Grundeinspritzsignal, das dann mittels multiplikativ und additiv wirkender Komponenten noch korrigiert wird. Eine dieser Komponenten - im gezeichneten Fall eine multiplikativ wirkende - wird jeweils den neuesten Erfordernissen angepaßt, so daß darüber hinausgehende Korrekturen mehr oder weniger einer Feinabstimmung entsprechen. Mittels der Abfrage 27 wird nun sichergestellt, daß das Berechnen und/oder der Austausch der Korrekturfaktoren des Blocks 24 nur dann erfolgt, wenn die Betriebsbereitschaft des gesamten Systems oder Teilen davon sichergestellt ist.The injection system sketched with the flow diagram according to FIG. 2 thus calculates a basic injection signal from the most important input variables, which is then corrected by means of components having a multiplicative and additive effect. One of these components - in the illustrated case a multiplicative one - is adapted to the latest requirements, so that corrections beyond this more or less correspond to a fine-tuning. Query 27 now ensures that the calculation and / or exchange of the correction factors of block 24 takes place only when the operational readiness of the entire system or parts thereof is ensured.

Was im Flußdiagramm nach Figur 2 im Zusammenhang mit der Einspritzsignalberechnung angegeben ist, läßt sich ohne weiteres auf die Zündungsberechnung übertragen, ferner z.B. auf die Leerlaufregelung bei einer Brennkraftmaschine oder - mehr oder weniger unabhängig von der Brennkraftmaschinensteuerung - auf sonstige Steuerungen bei einem Kraftfahrzeug beziehen.What is indicated in the flowchart according to FIG. 2 in connection with the injection signal calculation can easily be transferred to the ignition calculation, further e.g. refer to the idle control in an internal combustion engine or - more or less independently of the internal combustion engine control - to other controls in a motor vehicle.

Claims (8)

1. Elektronisches System zum Bilden von Steuergrößen bei Kraftfahrzeugen, insbesondere in Verbindung mit der Kraftstoffzumessung, abhängig von Eingangsvariablen und unter Einbeziehung wenigstens eines Kennfeldes (24), aus dem Daten auslesbar sind und die Daten im Sinne eines Lernprozesses korrigierbar bzw. austauschbar sind, dadurch gekennzeichnet, daß die Möglichkeit einer Änderung der eingespeicherten Daten nur bei gesicherter Betriebsbereitschaft wenigstens eines Teils des Systems erfolgt.1. Electronic system for forming control variables in motor vehicles, in particular in connection with the fuel metering, depending on input variables and including at least one map (24) from which data can be read out and the data can be corrected or exchanged in the sense of a learning process, thereby characterized in that the possibility of changing the stored data only takes place when at least part of the system is ready for operation. 2. Elektronisches System nach Anspruch 1, dadurch gekennzeichnet, daß die Möglichkeit einer Änderung der eingespeicherten Daten nur bei gesicherter Betriebsbereitschaft eines externen Speichers (14) erfolgt.2. Electronic system according to claim 1, characterized in that the possibility of changing the stored data takes place only when a secure operational readiness of an external memory (14). 3. Elektronisches System nach Anspruch 1, dadurch gekennzeichnet, daß als Maß für die Betriebsbereitschaft die Versorgungsspannung gilt.3. Electronic system according to claim 1, characterized in that the supply voltage applies as a measure of the operational readiness. 4. Elektronisches System nach Anspruch 3, dadurch gekennzeichnet, daß die Versorgungsspannung gepuffert wird.4. Electronic system according to claim 3, characterized in that the supply voltage is buffered. 5. Elektronisches System nach wenigstens einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß Grunddaten für die Steuergrößen in einem ersten Schritt (22) gebildet werden und änderbare Korrekturdaten einem n-dimensionalen Korrekturkennfeld entstammen.5. Electronic system according to at least one of claims 1 to 4, characterized in that basic data for the control variables are formed in a first step (22) and changeable correction data originate from an n-dimensional correction map. 6. Elektronisches System nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß die Änderung der eingespeicherten Daten durch die Freigabe eines Lernalgorythmus (29) und/oder der Freigabe der Speicherung (30) erfolgt.6. Electronic system according to claim 1 or 5, characterized in that the change in the stored data by releasing a learning algorithm (29) and / or releasing the storage (30). 7. Elektronisches System nach wenigstens einem der Ansprüche 1 bis 6, gekennzeichnet durch die Anwendung bei der Brennkraftmaschinensteuerung bzw. Regelung in Verbindung mit Kraftstoffzumessung, insbesondere Kraftstoffeinspritzung, und Zündung.7. Electronic system according to at least one of claims 1 to 6, characterized by the application in internal combustion engine control or regulation in connection with fuel metering, in particular fuel injection, and ignition. 8. Elektronisches System nach wenigstens einem der-Ansprüche 1 bis 6, gekennzeichnet durch seine Verwendung in Verbindung mit weiteren Steuerungsfunktionen im Kraftfahrzeug, insbesondere Blockierschutz- und/oder Getriebe.8. Electronic system according to at least one of claims 1 to 6, characterized by its use in connection with further control functions in the motor vehicle, in particular anti-lock and / or transmission.
EP85114944A 1984-12-24 1985-11-26 Electronic system to institute control values for a motor vehicle Withdrawn EP0187926A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3447340 1984-12-24
DE19843447340 DE3447340A1 (en) 1984-12-24 1984-12-24 ELECTRONIC SYSTEM FOR MAKING CONTROL SIZES IN MOTOR VEHICLES

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EP0187926A2 true EP0187926A2 (en) 1986-07-23
EP0187926A3 EP0187926A3 (en) 1987-02-04

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2510166B2 (en) * 1986-09-15 1996-06-26 日本電装株式会社 Intake air amount control device for internal combustion engine

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US4309971A (en) * 1980-04-21 1982-01-12 General Motors Corporation Adaptive air/fuel ratio controller for internal combustion engine
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US4363092A (en) * 1978-10-25 1982-12-07 Nissan Motor Company, Limited Malfunction preventing system for a microcomputer system
EP0036394A2 (en) * 1980-03-13 1981-09-23 FIAT AUTO S.p.A. Method and apparatus for calibrating the exhaust emission of an idling internal-combustion engine provided with an electronic injection apparatus
US4309971A (en) * 1980-04-21 1982-01-12 General Motors Corporation Adaptive air/fuel ratio controller for internal combustion engine
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GB2125577A (en) * 1982-08-16 1984-03-07 Nissan Motor Self monitoring system
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PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 87 (M-291)[1524] 20. April 1984; & JP-A-59 003 136 (TOYOTA JIDOSHA KOGYO K.K.) 09-01-1984 *

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EP0187926A3 (en) 1987-02-04
DE3447340A1 (en) 1986-07-03

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