EP0143313A2 - Dispositif de sécurité pour un moteur à combustion à commande électronique à microcalculateur - Google Patents

Dispositif de sécurité pour un moteur à combustion à commande électronique à microcalculateur Download PDF

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Publication number
EP0143313A2
EP0143313A2 EP84112555A EP84112555A EP0143313A2 EP 0143313 A2 EP0143313 A2 EP 0143313A2 EP 84112555 A EP84112555 A EP 84112555A EP 84112555 A EP84112555 A EP 84112555A EP 0143313 A2 EP0143313 A2 EP 0143313A2
Authority
EP
European Patent Office
Prior art keywords
microcomputer
voltage
supply voltage
actuator
monitoring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84112555A
Other languages
German (de)
English (en)
Other versions
EP0143313B1 (fr
EP0143313A3 (en
Inventor
Hermann Dipl.-Ing. Hemminger
Werner Dipl.-Ing. Jundt
Sybille Weller
Peter Dipl.-Ing. Werner
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 EP0143313A2 publication Critical patent/EP0143313A2/fr
Publication of EP0143313A3 publication Critical patent/EP0143313A3/de
Application granted granted Critical
Publication of EP0143313B1 publication Critical patent/EP0143313B1/fr
Expired 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
    • F02D41/30—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
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F02D41/266—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor the computer being backed-up or assisted by another circuit, e.g. analogue
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/226—Fail safe control for fuel injection pump
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2250/00—Engine control related to specific problems or objectives
    • F02D2250/12—Timing of calculation, i.e. specific timing aspects when calculation or updating of engine parameter is performed

Definitions

  • the invention relates to a device for an actuator controlled or regulated by a microcomputer on an internal combustion engine, in particular for an injection stage, with a device for voltage Supply of the microcomputer.
  • Voltage regulators with a built-in voltage monitor are therefore often used (see, for example, the voltage regulator LM 2935 from National Semiconductor), whose voltage monitor output is connected directly to the restart (reset) input of the microcomputer.
  • the microcomputer In the event of the shift voltage dropping below a certain threshold, the microcomputer is deactivated and the actuator is brought into a defined position. This means that no injection is possible for a considerable period of time (reset duration approx. 100 msec). This is independent of the period for which the stabilized voltage falls below the predetermined threshold of the voltage monitor.
  • the microcomputer also works at much lower voltages below the threshold voltage of the voltage monitor.
  • a disadvantage of these circuits is that the microcomputer is restarted (reset) during a large number of voltage drops in the stabilized supply voltage, although it would still be functional in and of itself. Since the restart of the microcomputer takes a certain amount of time (reset time about 100 to 200 msec), the actuator to be actuated is often blocked for an unnecessarily long time. In the case of an injection output stage, this means that no fuel can be injected into the cylinders.
  • the actuator actuated by the microcomputer is not blocked unnecessarily long in the event of a supply voltage drop.
  • the function of the microcomputer is maintained as long as possible.
  • Another advantage of the invention results in particular in the case of short supply voltage drops, for example during the starting phase. Then it is safe represents that during this time, due to a failure of peripheral microcomputer components, the cylinders of the internal combustion engine do not fill up with fuel.
  • Another advantage lies in the fact that the injection time essentially falls within the maximum of the fluctuating battery voltage, and thus short-term locking of the injection output stage has no influence on the injection.
  • FIG. 1a shows the profile of battery voltage and stabilized voltage, the reset duration of the microcomputer and the period of the functionality of the relevant actuator for devices as they belong to the prior art.
  • Figure 1b shows the corresponding signal curve of the device according to the invention and
  • Figure 2 shows an embodiment of the device according to the invention.
  • FIG. 1a shows the signal curve of the microcomputer reset duration and the duration of the functionality of the injection output stage for a predefined curve of the battery voltage and serves to explain it the problem with known safety devices.
  • the first diagram in FIG. It is assumed that the stabilization of the supply voltage U B no longer works at the minimum values of the battery voltage, so that small drops in the stabilized supply voltage U rod occur here. If these voltage drops U Stab fall below a threshold value U s , as is the case in the drawing in all three cases, the microcomputer is restarted by means of the voltage monitor. This restart takes a certain amount of time, denoted by T R , during which, as shown in the third diagram in FIG. 1a, the actuator is inoperative or locked. For somewhat longer reset times T R or for faster battery voltage fluctuations, this can lead to the actuator to be actuated being permanently locked. In the case of the injection output stage, this means that no fuel reaches the cylinders and the internal combustion engine cannot be started.
  • the corresponding mode of operation of the device according to the invention is to be described with reference to FIG. 1b.
  • the first diagram again shows the changes over time in the battery voltage U B and in the stabilized supply voltage U Stab .
  • the threshold value U Min for the actual functionality limit of the microcomputer is undershot, so that a restart of the microcomputer with the reset time period T R required for this must be initiated.
  • the functioning of the device according to the invention does not deviate from the prior art.
  • FIG. 2 shows an embodiment of the safety device according to the invention.
  • 10 denotes a microcomputer, to which, as indicated by several arrows, parameters of the internal combustion engine, such as the speed n, the temperature T, the air flow rate Q and the like, and the stabilized supply voltage are supplied.
  • a monitoring circuit 13 is connected to a monitoring output 12 of the microcomputer, the output of which is connected to an input 14, the restart (reset) input of the microcomputer.
  • the microcomputer 10 also actuates a timing element 15, which in turn actuates an injection output stage 16 via a resistor 17.
  • An output 18 of the injection output stage is connected to the battery voltage U B via one or more injection valves 19.
  • a line 21 from the monitoring circuit 13 and a line 22 from a voltage stabilization circuit 23 lead on a connection point 20 between the resistor 17 and the injection output stage 16. a diode 24 and 25 being connected in each of these two lines 21 and 22.
  • Each of the components timing element 15, monitoring circuit 13, injection output stage 16 is connected to the stabilized voltage supply U stab , which occurs as an output variable of the voltage stabilization circuit 23.
  • the basic mode of operation of the device will first be explained without further explanation of the "inner life" of the individual components 13, 16, 23. If the stabilized supply voltage is constant, i.e. that the device is in trouble-free operation, the potential on lines 22 and 21 takes on values close to 0. Since the output signals of the timing element 15 assume amplitudes between ground potential and the stabilized supply voltage, the diodes 24 and 25 are blocked for non-malfunction, so that the injection valve or valves 19 can be actuated accordingly.
  • the potential on line 22 assumes positive values.
  • the diode 25 is switched to the conductive state for the duration of the stabilized supply voltage falling below the setpoint, whereby the injection output stage is locked, ie the fuel metering is reduced to the value 0.
  • the potential on line 22 falls again low values and the diode 25 blocks. This measure serves that the timer 15 outputs an impermissible or incorrect injection time by a drop in the voltage UStab.
  • line 21 is only at high potential if the monitoring circuit 13 has identified a malfunction of the microcomputer via the monitoring output 12 of the microcomputer 10. If this was the case, the diode 24 remains conductive even after the setpoint value of the stabilized supply voltage has been reached again for at least the time period T R of the reset time period of the microcomputer.
  • the monitoring circuit 13 is constructed in detail as follows:
  • the monitoring output 12 of the microcomputer 10 leads via a high-pass filter consisting of the capacitor 27 and the resistor 28 to the base of a transistor 29, the emitter of which is connected to ground potential.
  • the collector is connected to the stabilized supply voltage via a resistor 30 and a capacitor 31.
  • the inverting input of an operational amplifier 32 is connected to the connection point between capacitance 31 and resistor 30.
  • the non-inverting input of the operational amplifier 32 is acted upon by the output signal of a voltage divider consisting of the resistors 33 and 34, which are connected between ground potential and the stabilized supply voltage.
  • the output of the operational amplifier 32 is via a further, voltage divider connected to ground consisting of resistors 35 and 36 connected to the base of a transistor.
  • the emitter of this transistor 37 is at ground potential while the collector is connected on the one hand to the stabilized supply voltage via a resistor 38 and on the other hand is connected to the diode 24 via the already mentioned line 21.
  • the signal path leads from the emitter of transistor 37 via a resistor 39 to the base of a transistor 40, the emitter of which is at ground potential.
  • the collector of this transistor 40 is connected via a resistor 41 to the stabilized supply voltage, via a resistor 42 at the inverting and via a resistor 43 at the non-inverting input of the operational amplifier 32 and via a line 44 at the input 14 of the microcomputer.
  • the stabilization circuit 23 which is known per se, consists of a bridge, the two bridge branches of which are connected with a resistor 46 and 47 or the resistor 48 and the Zener diode 49 between the collector of a transistor 50 and ground potential.
  • the connection point between the resistors 46 and 47 is connected to the inverting input of an operational amplifier 51, the connection point between the resistor 48 and the zener diode 49 to the non-inverting input of the operational amplifier 51.
  • From the output of the operational amplifier 51 leads on the one hand the line 22 to the diode 25 and a further signal path via the resistor 52 to the base of a transistor 53, the emitter of which is connected to ground potential.
  • the collector of this transistor 53 is connected via a resistor 54 to the base of transistor 50, the emitter of which is at the potential of the battery voltage.
  • the stabilized supply voltage is taken from the collector of transistor 50.
  • the known injection output stage 16 consists of two transistors 56 and 57, the emitter of transistor 56 being connected to the stabilized voltage supply and the collector being connected to the base of transistor 57, the emitter of which is at ground potential.
  • the collector of the transistor 57 is connected to the battery voltage via the output 18 and the one or more injection valves 19.
  • the injection output stage 16 is driven by the signals of the connection point 20 via a diode 58 which is located at the base of the transistor 56.
  • the base of transistor 56 is also connected to the stabilized voltage via a resistor 59.
  • the mode of operation of the injection output stage 16 is known and will not be explained in more detail below.
  • the operational amplifier 51 in the voltage stabilization circuit 23 acts in such a way that the transistor 50 as a series transistor is turned on more or less depending on the current value of the battery voltage in order to maintain the balance of the bridge at the input of the operational amplifier 51. If the battery voltage drops to such low values that the stabilized voltage can no longer be maintained, the output of the operational amplifier 51 runs at its upper stop and causes the injection output stage 16 to block when the diode 25 becomes conductive.
  • the monitoring circuit 13 is driven by the monitoring input 12 of the microcomputer, in such a way that in the case of a functional unit, the transistor 29 is constantly opened and closed.
  • the capacitance 31 is above the Resistor 30 charged.
  • the capacitor 31 can discharge via the resistor 42 and the resistor 41 if the transistor 40 is in the blocking state.
  • the dimensions of the components resistor 30, capacitor 31, resistor 42 and resistor 41 are defined in such a way that the potential at the inverting input for the functional microcomputer 10 is always below the potential at the non-inverting input of the operational amplifier 32. If the stabilized supply voltage drops to values at which the microcomputer 10 is no longer functional, a DC voltage potential is present at the monitoring output 12 and the transistor 29 is switched to its blocking state.
  • the capacitor 31 discharges until the voltage at the inverting input exceeds that at the non-inverting input of the operational amplifier 32. This switches and the transistor 37 blocks. Accordingly, line 21 is placed at high potential and injection end stage 16 is blocked. The capacitor 31 is charged again via the now conductive transistor 40 and the resistor 42 until the operational amplifier 32 changes its output variable. The period of time until it flips again is selected in accordance with the reset duration T R.
  • the monitoring circuit 13 thus ensures that the injection output stage is actually blocked only after the malfunction of the microcomputer 10 over the duration T R of a reset process.
  • the injection output stage 16 is blocked only for the duration of these drops in line 22 in order to avoid faults in the output of the injection time of the timing element 15.
  • the time intervals during which the injection output stage is functional always fall within the maxima of the battery voltage, so that the short-term locking of the injection output stages has no influence on the injection.
  • the special control of the injection output stages via the timing element 15 and the microcomputer 10 does not limit the basic idea of the invention. It is also possible that e.g. the timer 15 is integrated in the microcomputer or that the injection output stage 16 is controlled via digital values and a digital-to-analog converter.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP84112555A 1983-11-26 1984-10-18 Dispositif de sécurité pour un moteur à combustion à commande électronique à microcalculateur Expired EP0143313B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3342848 1983-11-26
DE19833342848 DE3342848A1 (de) 1983-11-26 1983-11-26 Sicherheitseinrichtung fuer eine elektronisch gesteuerte oder geregelte brennkraftmaschine mit mikrocomputer

Publications (3)

Publication Number Publication Date
EP0143313A2 true EP0143313A2 (fr) 1985-06-05
EP0143313A3 EP0143313A3 (en) 1986-01-22
EP0143313B1 EP0143313B1 (fr) 1989-06-07

Family

ID=6215353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84112555A Expired EP0143313B1 (fr) 1983-11-26 1984-10-18 Dispositif de sécurité pour un moteur à combustion à commande électronique à microcalculateur

Country Status (6)

Country Link
US (1) US4587939A (fr)
EP (1) EP0143313B1 (fr)
JP (1) JPH0641740B2 (fr)
AU (1) AU570730B2 (fr)
BR (1) BR8405961A (fr)
DE (2) DE3342848A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006988A1 (fr) * 1987-03-12 1988-09-22 Robert Bosch Gmbh Agencement de commutation pour debrancher des systemes electroniques
FR2660450A1 (fr) * 1990-03-30 1991-10-04 Marelli Autronica Sa Dispositif a maintien temporaire sous tension d'un calculateur et installation d'alimentation de moteur a combustion interne en comportant application.
DE19720191C1 (de) * 1997-05-14 1998-04-23 Siemens Ag Pufferschaltung für den Ausgang eines Mikroprozessors
US6062198A (en) * 1998-01-15 2000-05-16 Robet Boschgmbh Method and arrangement for operating an internal combustion engine
FR2786575A1 (fr) * 1998-09-28 2000-06-02 Siemens Ag Circuit de commande entre un port d'un microprocesseur et un organe de reglage

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3539732C2 (de) * 1984-11-09 1994-11-17 Nippon Denso Co Elektronisch gesteuertes Brennstoffeinspritzsystem für eine Brennkraftmaschine
JPS62106524A (ja) * 1985-11-01 1987-05-18 Clarion Co Ltd 車載用の機器のマイクロコンピユ−タリセツト回路
DE3603082A1 (de) * 1986-02-01 1987-08-06 Bosch Gmbh Robert Vorrichtung zum ruecksetzen von recheneinrichtungen
JPS6461830A (en) * 1987-08-31 1989-03-08 Aisin Seiki Protecting device for automobile microcomputer
JPH02233857A (ja) * 1989-03-07 1990-09-17 Mitsubishi Electric Corp 内燃機関のマイクロコンピュータを用いた制御装置
JPH0510201A (ja) * 1991-07-04 1993-01-19 Fuji Heavy Ind Ltd 車輌の制御方法
DE19855143C1 (de) 1998-11-30 2000-09-07 Bosch Gmbh Robert Schaltung und Verfahren zur Aufrechterhaltung der Ansteuerung von Peripherieelementen durch Mikroprozessoren
DE10031467C2 (de) * 2000-06-28 2002-05-08 Siemens Ag Schaltungsanordnung zur Ansteuerung eines elektrischen Schaltelements
DE102006046032B3 (de) * 2006-09-28 2007-10-31 Siemens Ag Steuervorrichtung mit Klemme 15-Halteschaltung
DE102019209805A1 (de) 2019-07-04 2021-01-07 Robert Bosch Gmbh Batteriemodul für ein Kraftfahrzeug und Kraftfahrzeug

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4255789A (en) * 1978-02-27 1981-03-10 The Bendix Corporation Microprocessor-based electronic engine control system
JPS5614301A (en) * 1979-07-13 1981-02-12 Hitachi Ltd Engine control unit
DE2945543A1 (de) * 1979-11-10 1981-05-21 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum steuern von betriebsparameterabhaengigen und sich wiederholenden vorgaengen fuer brennkraftmaschinen
JPS5713238A (en) * 1980-06-27 1982-01-23 Honda Motor Co Ltd Back-up system of control computer for efi engine
JPS5762405A (en) * 1980-09-04 1982-04-15 Honda Motor Co Ltd Compensating circuit abnormal power voltage of electronic circuit for vehicle
DE3035896C2 (de) * 1980-09-24 1984-02-09 Robert Bosch Gmbh, 7000 Stuttgart Schaltungsanordnung zur Erzeugung von Impulen bei Störung der Stromversorgung
DE3200856A1 (de) * 1981-05-22 1982-12-16 Robert Bosch Gmbh, 7000 Stuttgart Steuervorrichtung fuer brennkraftmaschinenbetriebene kraftfahrzeuge
DE3322240A1 (de) * 1982-07-23 1984-01-26 Robert Bosch Gmbh, 7000 Stuttgart Sicherheits-notlaufeinrichtung fuer den leerlaufbetrieb von kraftfahrzeugen
JPS59181235A (ja) * 1983-03-30 1984-10-15 Central Glass Co Ltd カルボニル化合物の製造方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988006988A1 (fr) * 1987-03-12 1988-09-22 Robert Bosch Gmbh Agencement de commutation pour debrancher des systemes electroniques
FR2660450A1 (fr) * 1990-03-30 1991-10-04 Marelli Autronica Sa Dispositif a maintien temporaire sous tension d'un calculateur et installation d'alimentation de moteur a combustion interne en comportant application.
DE19720191C1 (de) * 1997-05-14 1998-04-23 Siemens Ag Pufferschaltung für den Ausgang eines Mikroprozessors
FR2767234A1 (fr) * 1997-05-14 1999-02-12 Siemens Ag Circuit tampon pour la sortie d'un microprocesseur
US6062198A (en) * 1998-01-15 2000-05-16 Robet Boschgmbh Method and arrangement for operating an internal combustion engine
FR2786575A1 (fr) * 1998-09-28 2000-06-02 Siemens Ag Circuit de commande entre un port d'un microprocesseur et un organe de reglage

Also Published As

Publication number Publication date
DE3478629D1 (en) 1989-07-13
EP0143313B1 (fr) 1989-06-07
EP0143313A3 (en) 1986-01-22
AU570730B2 (en) 1988-03-24
JPS60119346A (ja) 1985-06-26
BR8405961A (pt) 1985-09-17
AU3354684A (en) 1985-05-30
US4587939A (en) 1986-05-13
JPH0641740B2 (ja) 1994-06-01
DE3342848A1 (de) 1985-06-05

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