WO1992017702A1 - Procede d'adaptation du temps de fermeture de systemes d'allumage de moteurs a combustion interne - Google Patents

Procede d'adaptation du temps de fermeture de systemes d'allumage de moteurs a combustion interne Download PDF

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Publication number
WO1992017702A1
WO1992017702A1 PCT/DE1992/000132 DE9200132W WO9217702A1 WO 1992017702 A1 WO1992017702 A1 WO 1992017702A1 DE 9200132 W DE9200132 W DE 9200132W WO 9217702 A1 WO9217702 A1 WO 9217702A1
Authority
WO
WIPO (PCT)
Prior art keywords
ignition
closing time
comparator
adaptation
time
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/DE1992/000132
Other languages
German (de)
English (en)
Inventor
Peter Werner
Günter Braun
Dietmar FLÄTGEN
Ulrich KÖLLE
Hans Loistl
Jürgen Stein
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 WO1992017702A1 publication Critical patent/WO1992017702A1/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
    • 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 invention relates to a method for adapting the closing time in ignition systems for internal combustion engines according to the preamble of the main claim.
  • a closing time control for internal combustion engines is already known from DE-PS 34 02 537, in which, however, two comparators and two reference marks are used to determine the ignition timing and for closing time control.
  • This known method ensures the required closing time when the coil parameters change (for example due to temperature influences) and with high speed dynamics.
  • a closing time control is carried out on the basis of monitoring the ignition coil current with two comparators, one of which tilts when 80% of the required ignition coil current is reached and the other tilts at 100%. It is disadvantageous that the time between switching on the ignition coil current and reaching the individual comparator thresholds is measured continuously and the charging time must be calculated from these measured times.
  • the method according to the invention with the characterizing features of the main claim has the advantage that the proposed solution is cheaper due to the lower demands on the hardware and software runtime, since a simple microprocessor can be used, and at the same time an optimal closing time output is guaranteed under all operating conditions.
  • the method according to the invention also has the advantage that tolerances of the output stages or of the cables used can be compensated for by the simple regulation.
  • the closing time adaptation offers a very good opportunity to react to the relatively slow change in various parameters, such as temperature influences, the change of ignition coil operating parameters, or contact resistances on the contacts caused by contamination.
  • the adaptation will advantageously be accelerated by taking into account a dynamic component, so that the closing time is adapted more quickly in the event of an acceleration.
  • the method also enables a defect in the primary circuit of the ignition coils to be identified by presetting and monitoring minimum and maximum closing times, to provide error information and to initiate any necessary catalyst protection measures, for example by interrupting the ignition and / or injection.
  • this method offers the advantage of carrying out a fault diagnosis by storing a predeterminable number of past values of the output levels of the comparator in a memory.
  • the output levels of the comparator will form an alternating sequence after a predetermined time, so that an error is detected if there is no alternation.
  • FIG. 1 shows a circuit arrangement for detecting and adapting the primary current
  • FIG. 2 shows a flow diagram for explaining the
  • FIG. 3 shows a circuit arrangement for detecting and temporarily storing the comparator output level.
  • FIG. 1 shows the microprocessor 1 of a control device (not shown) for the ignition output stages of the ignition system of an internal combustion engine.
  • This microprocessor is connected to the base of the ignition transistor 3, inter alia, via a connecting line 2.
  • the ignition transistor is connected via the primary winding of an ignition coil 4 to the battery voltage U B, for example of a vehicle battery, not shown.
  • the ignition coil 4 is connected on the one hand to the supply voltage U B and on the other hand to a spark plug 5.
  • the ignition transistor 3 is connected to ground with the inverting input of a comparator 6 and in parallel to it via a measuring resistor 7.
  • the non-inverting input of the comparator 6 is connected via a voltage divider 8 on the one hand to ground and on the other hand to a supply voltage U, which is not shown by a
  • Voltage stabilizer is supplied.
  • a comparison voltage U is set at the non-inverting input of the comparator 6 via the voltage divider 8.
  • the other output stages of the ignition system are connected so that the emitters of the individual ignition transistors are combined.
  • the cylinders which overlap in their closing angle, would have to be evaluated separately by a further evaluation circuit with elements 6, 7 and 8.
  • the circuit arrangement just described in Figure 1 has the following mode of operation.
  • the microprocessor 1 controls the base of the ignition transistor 3 at a time determined in the microprocessor 1 in accordance with the signals pending at its inputs 9 which are dependent on the operating conditions, so that this ignition transistor 3 becomes conductive.
  • a current then begins to flow in the primary winding of the ignition coil 4 in order to store the required ignition energy in the ignition coil.
  • the magnitude of this primary current is converted by the measuring resistor 7 into a voltage signal.
  • Voltage signal is in the comparator 6 with the reference voltage
  • Level at the output of the comparator tilts from 1 to 0 as soon as both voltages are the same or when the voltage to be tested at the measuring resistor 7 is greater than the comparison voltage U v .
  • the voltage level of the output of the comparator 6 is detected by the microprocessor 1 and the ignition transistor is controlled in the blocking state. It can therefore be determined on the basis of an O output signal that the current flow in the primary winding of the ignition coil 4 was sufficient for an optimal ignition spark.
  • the ignition transistor 3 is blocked for ignition, so that then no voltage is present at the inverting input of the comparator 6, as a result of which the output of the comparator 6 tilts again from 0 to 1.
  • the output of the comparator 6 sometimes changes from 1 to 0 towards the end of the closing time and sometimes not, since, due to a delayed adjustment of the closing time explained in more detail below, the coil current at the ignition time exceeds or falls below the target value. If the closing time is too short and the coil current thus does not reach the desired value, the comparator 6 does not flip at the output, which, when scanned, gives a pure 1 sequence. If the closing time is too long, the coil current constantly exceeds the setpoint and at the comparator 6 there is a pure O-sequence at the time of ignition scanned.
  • the output of the comparator 6 constantly changes from 0 to 1 and vice versa at the ignition point, so that the closing time is either extended or shortened by ⁇ t.
  • the value for the closing time T s is determined depending on the battery voltage U B.
  • the closing time T s is the time required to approx.
  • a factor FSZ factor closing time change
  • this FSZ 1.
  • the calculation of this factor can be suspended for operating conditions that require 100% ignition energy in the adaptation cycle, which includes the determination of the closing time T s required by the engine. That is, a query 11 checks whether the flag for switching off the factor - change in closing time "FSZ-Off" is set. If this is the case, the ignition coil-selective adaptation takes place in program step 12.
  • a query 13 checks whether the adaptation cycle for setting an optimal closing time has been completed. This is done, for example, by examining whether a predeterminable time period for a complete adaptation cycle T AZ, which is determined, for example, in the application for the individual motor types, has expired. A no to this question causes the "FSZ-Aus" flag to remain set and the closing time to be adapted the next time the program is run. If the query could be answered with yes, the flag "FSZ-Aus" is reset in program step 14.
  • the temperature change is a slow process that does not require fast control, so that a slow adaptation of correction variables, which is dependent on the coil system, is sufficient.
  • the second branch in the flowchart in the event that the "FSZ-Aus" flag was not set, provides an operating state-dependent correction of the closing time, for example in order to reduce the candle burnup. This procedure is superimposed on the adaptation procedure in the event of a no answer to question 11.
  • a factor FSZ is determined and made available via speed n and load, which is determined, for example, via throttle valve position ⁇ , which enables the closing time to be changed, the amount for the changing the closing time being determined for individual operating conditions in the application.
  • program step 18 the factor for the change in closing time FSZ is provided, for example, as a function of the load, which is determined via the throttle valve angle ⁇ , and the speed n.
  • it is checked again whether FSZ 1. A yes leads to leaving this program flow. A no to query 19 leads to program step 20.
  • the ignition coil-selective adaptation in the other program branch is activated by setting the flag "FSZ - OFF" in program step 22, and more Adaptation factors, for example, to be able to take into account a temperature change in the closing time adaptation. If the time condition for carrying out an adaptation cycle, which can be determined via an applicable value, is not fulfilled, the FSZ is included in the closing time setpoint for 100% charge in program step 21. The program block closing time adaptation is then exited and called again the next time the background program is run.
  • Need full load range The relevant operating states are determined and taken into account by the control unit when determining the closing time. This means, for example, that if an optimal ignition spark in the partial load range were only required to 80% of the coil target energy of an optimal ignition spark in the full load range, that can
  • Closing time can be corrected accordingly using the FSZ change in closing time factor.
  • the described adaptation process for the closing time would u. U. not fast enough, so that you can make a change in the closing time by taking into account a dynamic component.
  • the speed information n applied to the microprocessor 1 is evaluated and a change in speed is included in the output of the closing angle.
  • the described adaptation method it is also possible to identify a defect in the primary circuit by monitoring the adaptation. If, for example, a 1-sequence appears at the output of the comparator (i.e. ignition energy too low), despite the fact that the closing time has already been extended several times by the factor ⁇ t, the closing time is reached when a maximum value is reached, which is determined in the application. do not extend it any longer, but suggest a defect in the ignition system.
  • FIG. 3 shows a circuit arrangement which essentially corresponds to the circuit structure in FIG. 1, and the same components therefore have the same reference numerals.
  • the microprocessor 1 is connected to an output stage 23 via a connecting line 2.
  • This output stage 23 is only shown symbolically and consists of a control transistor, an ignition coil to which a spark plug 5 is connected on the secondary side and an evaluation circuit, as has already been described, for example, in FIG.
  • the status output 26 of the output stage 23 is set in each case when the threshold for the desired coil current is exceeded and is conducted to a latch 27 via a connecting line 24.
  • further ignition output stages for example the ignition output stage 23a and still further ignition output stages, are connected to the latch 27 via connecting lines 24a to n.
  • the output level of the evaluation circuit arranged in the ignition output stage is continuously applied to the inputs of the latch 27 via the connecting line.
  • the status as to whether the coil set current has been reached is temporarily stored at the ignition point and this value is updated at the ignition point.
  • the ignition time that is the time at which the status of the ignition output stage is to be stored, is sent to the latch 27 via a data bus 28.
  • the microprocessor 1 can now take this value from the latch 27 at any time for the determination of the next closing time without the background program having to be interrupted at the time of ignition, as in FIG. 1.

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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)

Abstract

Un procédé d'adaptation du temps de fermeture d'étages terminaux d'allumage dans le circuit de courant primaire de bobines d'allumage de moteurs à combustion interne permet de déterminer le temps de fermeture requis pour fournir à la bobine d'allumage l'énergie permettant d'obtenir une étincelle d'allumage optimale. Le procédé met en oeuvre un comparateur (6) qui compare l'intensité du courant dans la bobine d'allumage avec une valeur de consigne (UV). Afin de tirer des conclusions permettant d'adapter le temps de fermeture, le niveau de sortie du comparateur est capté à une porte d'entrée d'un microprocesseur (1) au moment de l'allumage et est traité afin de déterminer le temps de fermeture.
PCT/DE1992/000132 1991-03-30 1992-02-22 Procede d'adaptation du temps de fermeture de systemes d'allumage de moteurs a combustion interne Ceased WO1992017702A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4110518 1991-03-30
DEP4110518.4 1991-03-30
DE4119570 1991-06-14
DEP4119570.1 1991-06-14

Publications (1)

Publication Number Publication Date
WO1992017702A1 true WO1992017702A1 (fr) 1992-10-15

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PCT/DE1992/000132 Ceased WO1992017702A1 (fr) 1991-03-30 1992-02-22 Procede d'adaptation du temps de fermeture de systemes d'allumage de moteurs a combustion interne

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WO (1) WO1992017702A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012340A1 (fr) * 1991-12-18 1993-06-24 Robert Bosch Gmbh Procede de reglage de la duree de fermeture
CN1050410C (zh) * 1995-04-04 2000-03-15 三菱电机株式会社 内燃机的点火装置
WO2002099273A1 (fr) 2001-06-06 2002-12-12 Siemens Aktiengesellschaft Dispositif d'allumage pour moteur a combustion interne
CN115288905A (zh) * 2022-08-12 2022-11-04 潍柴动力股份有限公司 气体发动机点火控制方法、装置与计算机可读存储介质

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018202A (en) * 1975-11-20 1977-04-19 Motorola, Inc. High energy adaptive ignition via digital control
DE2850115A1 (de) * 1978-11-18 1980-05-29 Bosch Gmbh Robert Zuendanlage fuer brennkraftmaschinen
US4366800A (en) * 1980-03-14 1983-01-04 Robert Bosch Gmbh Dwell angle control for internal combustion engine ignition system
US4467776A (en) * 1981-07-24 1984-08-28 Robert Bosch Gmbh Dwell period control for engine ignition
EP0132985A2 (fr) * 1983-07-21 1985-02-13 LUCAS INDUSTRIES public limited company Commande de l'allumage pour moteur à combustion interne
DE3447341A1 (de) * 1984-12-24 1986-06-26 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur schliesswinkelregelung einer fremdgezuendeten brennkraftmaschine
EP0229643A2 (fr) * 1986-01-16 1987-07-22 Atlas Fahrzeugtechnik GmbH Système d'allumage pour moteur à combustion interne
DE3936259A1 (de) * 1988-11-02 1990-05-03 Hitachi Ltd Vorrichtung zur motorsteuerung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018202A (en) * 1975-11-20 1977-04-19 Motorola, Inc. High energy adaptive ignition via digital control
DE2850115A1 (de) * 1978-11-18 1980-05-29 Bosch Gmbh Robert Zuendanlage fuer brennkraftmaschinen
US4366800A (en) * 1980-03-14 1983-01-04 Robert Bosch Gmbh Dwell angle control for internal combustion engine ignition system
US4467776A (en) * 1981-07-24 1984-08-28 Robert Bosch Gmbh Dwell period control for engine ignition
EP0132985A2 (fr) * 1983-07-21 1985-02-13 LUCAS INDUSTRIES public limited company Commande de l'allumage pour moteur à combustion interne
DE3447341A1 (de) * 1984-12-24 1986-06-26 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zur schliesswinkelregelung einer fremdgezuendeten brennkraftmaschine
EP0229643A2 (fr) * 1986-01-16 1987-07-22 Atlas Fahrzeugtechnik GmbH Système d'allumage pour moteur à combustion interne
DE3936259A1 (de) * 1988-11-02 1990-05-03 Hitachi Ltd Vorrichtung zur motorsteuerung

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993012340A1 (fr) * 1991-12-18 1993-06-24 Robert Bosch Gmbh Procede de reglage de la duree de fermeture
CN1050410C (zh) * 1995-04-04 2000-03-15 三菱电机株式会社 内燃机的点火装置
WO2002099273A1 (fr) 2001-06-06 2002-12-12 Siemens Aktiengesellschaft Dispositif d'allumage pour moteur a combustion interne
DE10127362A1 (de) * 2001-06-06 2003-01-02 Siemens Ag Zündanlage für eine Brennkraftmaschine
DE10127362C2 (de) * 2001-06-06 2003-05-15 Siemens Ag Zündanlage für eine Brennkraftmaschine
US6792926B2 (en) 2001-06-06 2004-09-21 Siemens Aktiengesellschaft Ignition system for an internal combustion engine
CN115288905A (zh) * 2022-08-12 2022-11-04 潍柴动力股份有限公司 气体发动机点火控制方法、装置与计算机可读存储介质

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