EP0672827A1 - Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion - Google Patents

Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion Download PDF

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Publication number
EP0672827A1
EP0672827A1 EP94104420A EP94104420A EP0672827A1 EP 0672827 A1 EP0672827 A1 EP 0672827A1 EP 94104420 A EP94104420 A EP 94104420A EP 94104420 A EP94104420 A EP 94104420A EP 0672827 A1 EP0672827 A1 EP 0672827A1
Authority
EP
European Patent Office
Prior art keywords
ignition
output stage
base
stage transistor
value
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Withdrawn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
EP94104420A
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German (de)
English (en)
Inventor
Jörn Dipl.-Ing. Heinig
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to EP94104420A priority Critical patent/EP0672827A1/fr
Priority to US08/404,367 priority patent/US5631564A/en
Priority to JP7085957A priority patent/JPH07269454A/ja
Publication of EP0672827A1 publication Critical patent/EP0672827A1/fr
Withdrawn legal-status Critical Current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
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00—Other installations
    • F02P3/02—Other installations having inductive energy storage, e.g. arrangements of induction coils
    • F02P3/04—Layout of circuits
    • F02P3/055—Layout of circuits with protective means to prevent damage to the circuit, e.g. semiconductor devices or the ignition coil
    • F02P3/0552—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/0554—Opening or closing the primary coil circuit with semiconductor devices using digital techniques

Definitions

  • the invention relates to a method for monitoring the secondary circuits in the ignition device of a spark ignition internal combustion engine according to the preamble of claim 1. It also relates to an apparatus for performing this method.
  • Electrical ignition devices for spark-ignition internal combustion engines generally use one or more ignition coils as energy stores for the ignition sparks for igniting the fuel-air mixture in the individual cylinders.
  • an increasing current flows through the primary winding of the assigned ignition coil and energy is stored in it. Switching off the primary current triggers an ignition by the stored energy flowing through the secondary winding of the ignition coil into the spark plug, where it is broken down in the spark.
  • the energy stored in the ignition coil is converted into heat after opening the primary circuit in the ignition output stage transistor after it has been turned on as a result of the overvoltage by its protective circuit .
  • Monitoring the secondary circuits in simple engine or ignition control devices has so far been too complex and is therefore not carried out.
  • the heat dissipation of the ignition output stage is oversized enough to prevent damage to the output stage in the event of a fault.
  • An interruption in the secondary circuit cannot be detected by measuring the current or voltage on the primary side of the ignition coil, but it can be detected on the secondary side (current too low, excessive voltage). However, this measurement is complex because of the high voltages that occur.
  • An ignition device for internal combustion engines is known from EP 0 470 277 A1, in which a sensor is arranged between the ignition coil and ground, by means of which the duration and amplitude of the secondary current can be measured and evaluated in the microprocessor of the ignition control device for undesired interruptions in the secondary circuit.
  • the object of the invention is to provide a method for monitoring the secondary circuits for interruptions in an ignition device of a spark-ignition internal combustion engine, in that no measurement of high voltages is required and that ignition energy-reducing current consumers in the secondary circuit are not required.
  • the method according to the invention is based on the fact that, in the event of an interruption in the secondary circuit, the energy stored in the primary winding of the ignition coil during the closing time after the primary circuit has been opened in the resulting overvoltages by means of its conventional protective circuit again conductive ignition stage transistor is converted into heat. This reduces the temperature-dependent base-emitter voltage V BE of this transistor.
  • FIG. 1 shows a diagram of the base-emitter voltage V BE plotted on the ordinate over the collector current I C (abscissa) with the temperature as a parameter for a typical ignition output stage transistor.
  • the collector current I C of a typical ignition output stage transistor rises to its setpoint of 8 A, for example within a time of approx. 2 ms, the base-emitter voltage V BE at a collector current I C of approx. 100 mA to a value of approx. 1.25V at an assumed temperature of 25 ° C, (to 1.0V at 85 ° C operating temperature or only) to 0.8V at 125 ° C, see Figure 1.
  • the base-emitter voltage V BE rises within a time of approximately 10 ⁇ s to a value of approximately 0.95 V at 85 ° C. (assumed operating temperature) that can be derived from FIG. 1 by interpolation. At 25 ° C it would be about 1.2V, at 125 ° C, however, only about 0.7V.
  • the collector current I C has increased from 10 ⁇ s to approx. 40mA.
  • the ratio of V BE85 ° / V BE125 ° increases as the collector current I C decreases . It is therefore advisable to measure the base-emitter voltages V BE at small collector currents I C.
  • the voltage V BE can be measured in a simple manner. In order to avoid sample scattering of the individual transistors, it is not the absolute value of the base-emitter voltage of an individual transistor but rather a comparison value (quotient, difference) that is formed and evaluated from the measured values of at least two transistors.
  • the limit value can be specified, but it can also be determined adaptively from a comparison value (e.g. during initial start-up) with intact ignition output stage transistors, for example by multiplication by a predetermined factor.
  • Each ignition circuit consists of an ignition output stage transistor T1, T2, an ignition coil SP1, SP2 formed from a primary winding P1, P2 and a secondary winding S1, S2 and at least one spark plug Z1, Z2.
  • each ignition circuit leads from the positive pole V B of a voltage source, not shown, via the primary winding P1, P2 and the collector-emitter path C1-E1, C2-E2 of the ignition output stage transistor T1, T2 to the negative pole of the voltage source.
  • the secondary circuit of each ignition circuit leads from the negative pole through the secondary winding S1, S2 and the spark plug (s) Z1, Z2 back to the negative pole.
  • the ignition circuits are controlled by a (engine or ignition) control unit ST, which contains a microprocessor ⁇ P, which determines the closing and ignition angles for the ignition circuits from various input signals (not shown) and corresponding control signals to the basic connections B1 and B2 of the ignition Power stage transistors T1, T2 transmitted.
  • a (engine or ignition) control unit ST which contains a microprocessor ⁇ P, which determines the closing and ignition angles for the ignition circuits from various input signals (not shown) and corresponding control signals to the basic connections B1 and B2 of the ignition Power stage transistors T1, T2 transmitted.
  • the base connections B1, B2, which are decoupled from one another by diodes D1, D2, are connected to a measurement input M of the control unit ST.
  • the elements shown between this measurement input M and an error output connection F of the control unit ST in this exemplary embodiment consist of unused elements which are usually present in the microprocessor ⁇ P.
  • a measuring circuit MS which measures the analog base-emitter voltages V BE1 and V BE2 present at the measuring input M at certain times, converts them into digital values and, if necessary, also amplifies them, a memory area FIFO, described here for simplicity as an FI-FO (FIRST IN; FIRST OUT) memory or memory register with two memory locations, a subtractor SUB, which outputs at its output a value corresponding to the amount of the difference between the two values stored in the FIFO memory, the comparison value D, and a comparator K, which compares this quantity D with a predetermined limit value G and outputs an output signal, error signal F, if the quantity D exceeds or falls below this limit value in a predetermined manner.
  • FI-FO FIRST IN; FIRST OUT
  • the method or the device for monitoring the secondary circuits works as follows: With each start (closing angle) of one of the alternating periodically appearing control signals st1, st2 for the two ignition output stage transistors T1, T2, the measuring circuit MS is activated by the activation delay of about 10 ⁇ s at the measuring input M of the control unit ST after a program or circuit-related activation delay measured value of the base-emitter voltage V BE1 or V BE2 of the ignition output stage transistor T1 or T2 to measure. As already mentioned above, this value is approximately 0.95 V at an operating temperature of 85 ° C. and a collector current I C of approximately 40 mA reached after this time.
  • the recorded value (for example V BE1 ) is measured, digitized and then stored in place 1 in a memory FIFO with two storage locations.
  • the base-emitter voltage V BE2 is detected, measured, digitized and stored (likewise place 1), the previously stored value V BE1 being shifted one place to place 2, so that both values are now in the memory.
  • Both storage locations are each connected to an input of the subtractor SUB, which forms a comparison value D corresponding to the amount of the difference V BE1 - V BE2 of the two values stored in the memory FIFO and outputs it at its output.
  • a new value V BE1 * is stored in position 1
  • the value V BE2 is moved to position 2 and the old value V BE1 is pushed (deleted) from the memory, whereupon the difference V BE2 - V BE1 in the subtractor SUB * formed and a corresponding comparison value D is output and so on.
  • the comparison values D appearing at the output of the subtractor SUB are compared in the following comparator K with a predetermined or adaptively determined limit value G, for example set to 0.3V.
  • This comparator K outputs an output signal (error signal F) when the magnitude of the quantity D exceeds this limit value G. This would mean, for example, that the ignition output transistor T1 has reached a temperature of approximately 135 ° C., while the other ignition output transistor T2 is at an operating temperature of 85 ° C., and vice versa.
  • the quotient of the two measured values can also be formed and, for example in a window comparator, compared with a limit value for exceeding or falling below.
  • the fault signal F can be used to either only trigger a warning signal, but it can also serve to switch off the cylinder concerned (ignition and fuel injection) or the entire internal combustion engine to avoid major damage.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
EP94104420A 1994-03-18 1994-03-18 Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion Withdrawn EP0672827A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP94104420A EP0672827A1 (fr) 1994-03-18 1994-03-18 Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion
US08/404,367 US5631564A (en) 1994-03-18 1995-03-15 Method and apparatus for monitoring the ignition device of an internal combustion engine
JP7085957A JPH07269454A (ja) 1994-03-18 1995-03-20 内燃機関点火装置を監視するための方法及び装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94104420A EP0672827A1 (fr) 1994-03-18 1994-03-18 Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion

Publications (1)

Publication Number Publication Date
EP0672827A1 true EP0672827A1 (fr) 1995-09-20

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EP94104420A Withdrawn EP0672827A1 (fr) 1994-03-18 1994-03-18 Méthode et dispositif de surveillance pour système d'allumage d'un moteur à combustion

Country Status (3)

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US (1) US5631564A (fr)
EP (1) EP0672827A1 (fr)
JP (1) JPH07269454A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010004124B4 (de) * 2009-10-21 2015-10-08 Faurecia Emissions Control Technologies Diagnoseverfahren und -vorrichtung für thermische Regenerator-Nachbehandlungsvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530987A1 (de) * 1975-07-11 1977-01-20 Bbc Brown Boveri & Cie Zuendsystem fuer brennkraftmaschinen
GB2064645A (en) * 1979-12-04 1981-06-17 Bosch Gmbh Robert Ignition System for an Internal Combustion Engine
JPS6267473A (ja) * 1985-09-20 1987-03-27 Oki Electric Ind Co Ltd 電流測定方式
EP0373694A1 (fr) * 1988-12-13 1990-06-20 STMicroelectronics S.r.l. Circuit de diagnostic pour unités fournissant une commande de courant et protection contre la surchauffe dans des installations de puissance à semi-conducteur
JPH05203698A (ja) * 1992-01-27 1993-08-10 Oki Electric Ind Co Ltd Ｍｅｓｆｅｔの熱抵抗測定方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56107961A (en) * 1980-01-16 1981-08-27 Fuji Heavy Ind Ltd Transient state detector for engine
DE59007572D1 (de) * 1990-08-06 1994-12-01 Siemens Ag Zündeinrichtung für Brennkraftmaschinen.
FR2676506B1 (fr) * 1991-05-15 1993-09-03 Siemens Automotive Sa Procede et dispositif de detection de rates d'allumage dans un cylindre de moteur a combustion interne et leur application.
US5446385A (en) * 1992-10-02 1995-08-29 Robert Bosch Gmbh Ignition system for internal combustion engines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2530987A1 (de) * 1975-07-11 1977-01-20 Bbc Brown Boveri & Cie Zuendsystem fuer brennkraftmaschinen
GB2064645A (en) * 1979-12-04 1981-06-17 Bosch Gmbh Robert Ignition System for an Internal Combustion Engine
JPS6267473A (ja) * 1985-09-20 1987-03-27 Oki Electric Ind Co Ltd 電流測定方式
EP0373694A1 (fr) * 1988-12-13 1990-06-20 STMicroelectronics S.r.l. Circuit de diagnostic pour unités fournissant une commande de courant et protection contre la surchauffe dans des installations de puissance à semi-conducteur
JPH05203698A (ja) * 1992-01-27 1993-08-10 Oki Electric Ind Co Ltd Ｍｅｓｆｅｔの熱抵抗測定方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 261 (P - 609) 25 August 1987 (1987-08-25) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 626 (P - 1647) 18 November 1993 (1993-11-18) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112010004124B4 (de) * 2009-10-21 2015-10-08 Faurecia Emissions Control Technologies Diagnoseverfahren und -vorrichtung für thermische Regenerator-Nachbehandlungsvorrichtung

Also Published As

Publication number Publication date
US5631564A (en) 1997-05-20
JPH07269454A (ja) 1995-10-17

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