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EP0881382A1 - Verfahren zur Steuerung des Zündzeitpunktes einer Brennkraftmaschine - Google Patents

Verfahren zur Steuerung des Zündzeitpunktes einer Brennkraftmaschine Download PDF

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Publication number
EP0881382A1
EP0881382A1 EP98401217A EP98401217A EP0881382A1 EP 0881382 A1 EP0881382 A1 EP 0881382A1 EP 98401217 A EP98401217 A EP 98401217A EP 98401217 A EP98401217 A EP 98401217A EP 0881382 A1 EP0881382 A1 EP 0881382A1
Authority
EP
European Patent Office
Prior art keywords
current
ignition
coil
breaking
thresholds
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
EP98401217A
Other languages
English (en)
French (fr)
Other versions
EP0881382B1 (de
Inventor
C. Dekoninck
W. Isambert
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.)
Sagem SA
Original Assignee
Sagem SA
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 Sagem SA filed Critical Sagem SA
Publication of EP0881382A1 publication Critical patent/EP0881382A1/de
Application granted granted Critical
Publication of EP0881382B1 publication Critical patent/EP0881382B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • F02P17/10—Measuring dwell or antidwell time
    • 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
    • F02P3/045—Layout of circuits for control of the dwell or anti dwell time
    • F02P3/0453—Opening or closing the primary coil circuit with semiconductor devices
    • F02P3/0456—Opening or closing the primary coil circuit with semiconductor devices using digital techniques

Definitions

  • the advance expressed by an angular offset, can be fixed mechanically by a cam finger driven by the motor or, as in the case considered here, by an electronic control.
  • This advance and spark generation command is carried out by abrupt interruption of current in the coil, which develops the high voltage causing the spark.
  • the coil is supplied at an instant prior to that provided for the spark, so that its current, whose value increases gradually, reaches, at break, the level required to provide the energy necessary to the spark.
  • the coil ages and we must also systematically increase its duration of excitation so that it always satisfies, at the end of its life, the requirements to excite the candle. Therefore, at the start of life, the candle is overexcited.
  • control circuit which excites the coil must be adapted with accuracy of their electrical characteristics. Indeed, the duration excitation of the coil, to increase the current to the value the spark at which the spark is caused depends on inductance of the coil. The supplier of this coil must therefore maintain tight tolerances; moreover, these coils are more expensive and not interchangeable with those of another supplier, a a priori different.
  • EP-281 528A teaches to determine a forecast curve for the current as a function of time, a point of which is determined, by detection the passage to a current threshold, to determine the future instant at which the current must be interrupted to produce the spark.
  • a current threshold if a low breaking current is sufficient, the threshold is likely to be beyond the value of this current and we cannot therefore set it to a optimal value. We could consider choosing a very low threshold, but the measurement accuracy would be affected.
  • the present invention aims to overcome this drawback.
  • the invention relates to an ignition control method an internal combustion engine, by breaking a coil current, in which a predetermined evolution curve for the current and we measure, at least for a moment, the real current, by passage a diagnostic threshold, to modify the evolution curve forecast and determine the instant of failure, characterized process by the fact that, to modify the portion of the current curve of the coil corresponding to high current values which are not always damage to ignition, the real current is forced at times beyond the breaking current to cross the diagnostic threshold.
  • the ignition assembly shown comprises a microcontroller 1 controlling a power transistor-switch 2 in series with a winding 3 constituting the primary of a step-up transformer voltage, usually called coil, whose secondary 4 supplies the spark plug of an internal combustion vehicle engine.
  • a circuit 6 of current measurement is connected in series with the winding 3, supplied under the voltage Vb of a battery not shown, and it provides its measurements to the microcontroller 1.
  • the microcontroller 1 has, conventionally, various engine operating condition information from, to through an input link 11, of sensors not shown, such as the angular position of the motor shaft, the temperature of the latter, the battery voltage, manifold pressure, air flow and others.
  • the microcontroller 1 further comprises a memory 12 containing a current response characteristic I / excitation duration D (FIG. 2A), or delay in the growth of the current, to determine, on the one hand, a optimal breaking current Ir in winding 3 as a function of motor operating conditions, current inducing current optimal secondary in secondary 4 and therefore in candle 5 and the instant Tr of this rupture and, on the other hand, an instant T0, prior to this one, from the start of the excitation of the winding 3.
  • a current response characteristic I / excitation duration D FOG. 2A
  • the coil current thus has time to increase to the desired value, from breaking current Ir or setpoint, between these two instants T0 and Tr.
  • the characteristic I f (D) of FIG. 2A, or predetermined evolutionary trend curve, corresponds to an approximation, by three straight lines, of the real characteristic.
  • the first segment S0 from T0 to T1 corresponds to a simple delay, at zero current, of the two segments which follow it.
  • the second segment S1 here has a lower determined slope than that of the third segment S2 which follows it for the high currents, here around 4 to 12 amps.
  • the current measurement circuit 6 is in fact here an ammeter circuit with diagnostic thresholds which does not provide a measurement signal M (FIG. 2B) only when the current flowing through it is between two thresholds of diagnosis, IA and IB, here respectively of typically 2.5 and 6.5 A.
  • a such component has the commercial reference VB 029 and is marketed by SGS.
  • the power switch 2 is there integrated. Note, however, that any electronic ammeter is suitable.
  • the microcontroller 1 has conventionally determined an optimal breaking current Ir and a corresponding ignition advance angle, translated from the engine rotation speed into an advance temporal Av determining an instant tr , at which the actual current I must have reached exactly the ignition or rupture setpoint value Ir to be then abruptly interrupted by switch 2.
  • the memory 12 in fact comprises a set of curves, addressed as a function of the value, which is measured, of the battery voltage Vb.
  • the two diagnostic thresholds (2.5 and 6.5 A), allowing to know the value of the current when it passes through these thresholds, are respectively associated with the two segments S1 and S2. So when the current I increases from the initial instant T0, the delay TA of the front amount of signal M, for the low threshold IA, provides a measurement point for the real curve S1 '. It is the same for the falling front which goes at the instant TB follow the crossing of the high threshold IB.
  • FIG. 2A represents in detail correspondences expected current / delay (12) and not those actually measured (S1 ', S2 ').
  • the segments S1 'and S2' being of higher slopes to those predicted (S1, S2), the measured instants of passage to thresholds IA and IB are earlier than the expected instants TA and TB, so that the actual current breaking point Ir 'at time Tr is greater than the expected current Ir.
  • the high threshold IB may not always be crossed, if the optimal current Ir, does not reach, taking into account the conditions of present, the high threshold IB.
  • the microprocessor 1 forces by instants the actual current beyond the optimal breaking current Ir, for crossing the diagnostic threshold IB relating to segment S2.
  • a measurement point is thus obtained in the upper part S2 of the total characteristic S0, S1, S2 which, by itself, already allows good correct this total characteristic, the general appearance of which is known.
  • the delay T2 provides a first point at zero current and measures it at high threshold IB provides a second point for adjusting the slope of the segment S2.
  • the intermediate segment S1, provided in this example, is used here to improve the above correction, at low current. Its rotation around the point T1 at zero current can also be determined from the measurement of the high threshold IB, that is to say that then the curve S1, S2 pivots in block around point T1.
  • the measurement at the low threshold IA then only provides additional precision.
  • the determination of the measured point of the characteristic real can, in other embodiments, be made by a circuit more conventional ammeter, without current threshold, measuring current I at a predetermined delay instant which constitutes a time threshold of climb.

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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)
EP19980401217 1997-05-28 1998-05-20 Verfahren zur Steuerung des Zündzeitpunktes einer Brennkraftmaschine Expired - Lifetime EP0881382B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9706528 1997-05-28
FR9706528A FR2764004B1 (fr) 1997-05-28 1997-05-28 Procede de commande de l'allumage d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP0881382A1 true EP0881382A1 (de) 1998-12-02
EP0881382B1 EP0881382B1 (de) 2002-09-25

Family

ID=9507320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980401217 Expired - Lifetime EP0881382B1 (de) 1997-05-28 1998-05-20 Verfahren zur Steuerung des Zündzeitpunktes einer Brennkraftmaschine

Country Status (3)

Country Link
EP (1) EP0881382B1 (de)
DE (1) DE69808174T2 (de)
FR (1) FR2764004B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007038945A1 (en) * 2005-09-21 2007-04-12 Freescale Semiconductor, Inc. Controller and method for controlling an ignition coil
WO2009040299A1 (de) * 2007-09-20 2009-04-02 Continental Automotive Gmbh Verfahren und vorrichtung zum betreiben einer zündspule und verfahren zum herstellen einer solchen vorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402537A1 (de) * 1984-01-26 1985-08-01 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur schliesszeitregelung fuer brennkraftmaschinen
EP0281528A1 (de) * 1987-03-02 1988-09-07 MARELLI AUTRONICA S.p.A. Zündsystem mit verstellbarer Energie für Brennkraftmaschinen
EP0590181A1 (de) * 1992-09-29 1994-04-06 Siemens Aktiengesellschaft Verfahren zur Ermittlung der Schliessdauer des Primärkreises in einer Zündanlage einer Brennkraftmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3402537A1 (de) * 1984-01-26 1985-08-01 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur schliesszeitregelung fuer brennkraftmaschinen
EP0281528A1 (de) * 1987-03-02 1988-09-07 MARELLI AUTRONICA S.p.A. Zündsystem mit verstellbarer Energie für Brennkraftmaschinen
EP0590181A1 (de) * 1992-09-29 1994-04-06 Siemens Aktiengesellschaft Verfahren zur Ermittlung der Schliessdauer des Primärkreises in einer Zündanlage einer Brennkraftmaschine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007038945A1 (en) * 2005-09-21 2007-04-12 Freescale Semiconductor, Inc. Controller and method for controlling an ignition coil
WO2009040299A1 (de) * 2007-09-20 2009-04-02 Continental Automotive Gmbh Verfahren und vorrichtung zum betreiben einer zündspule und verfahren zum herstellen einer solchen vorrichtung

Also Published As

Publication number Publication date
DE69808174D1 (de) 2002-10-31
DE69808174T2 (de) 2003-05-28
FR2764004B1 (fr) 1999-07-16
FR2764004A1 (fr) 1998-12-04
EP0881382B1 (de) 2002-09-25

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