WO1992019947A1 - Procede et dispositif pour la detection d'une combustion detonante dans un moteur a combustion interne - Google Patents

Procede et dispositif pour la detection d'une combustion detonante dans un moteur a combustion interne Download PDF

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Publication number
WO1992019947A1
WO1992019947A1 PCT/DE1992/000246 DE9200246W WO9219947A1 WO 1992019947 A1 WO1992019947 A1 WO 1992019947A1 DE 9200246 W DE9200246 W DE 9200246W WO 9219947 A1 WO9219947 A1 WO 9219947A1
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WO
WIPO (PCT)
Prior art keywords
internal combustion
cylinders
combustion engine
knock
knocking
Prior art date
Application number
PCT/DE1992/000246
Other languages
German (de)
English (en)
Inventor
Bernhard Mencher
Michael Froeschle
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 WO1992019947A1 publication Critical patent/WO1992019947A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
    • G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
    • G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor

Definitions

  • the invention relates to a method and a device for detecting knocking combustion in an internal combustion engine according to the preamble of claim 1 or according to the preamble of claim 9.
  • the method according to the invention and the device according to the present invention for detecting knocking combustion in an internal combustion engine have the advantage that the detection reliability of knocking combustion can be carried out with high accuracy even without cylinder detection or phase sensor, so that a simple procedure or a relatively simple device for detecting knocking combustion, the non-detection of knocking burns and false detections can be excluded with a high degree of certainty.
  • the cylinders of the internal combustion engine are divided into groups to which various knock detection factors are assigned.
  • knocking combustion within a group of cylinders can be distinguished from non-knocking combustion on the basis of the different knock detection factors.
  • the method is characterized in that it is very simple and therefore inexpensive to implement.
  • errors in the detection of knocking combustion can be reduced to a minimum.
  • the different knock detection factors of the different cylinder groups are specified as a fixed value or determined on the basis of a characteristic curve or a characteristic diagram. As a result, the different knock detection factors can be made available in a simple manner for the detection of knocking combustion.
  • an embodiment of the method is preferred in which the inner and outer cylinders of an internal combustion engine with four cylinders arranged in series are combined to form a group.
  • the knock detection factors of the inner and outer cylinder groups can be distinguished without any particular effort, so that the method for knock detection can be implemented simply and inexpensively.
  • an embodiment of the method is preferred in which an assignment is generated on the crankshaft with the aid of the reference mark, on the basis of which the output signals of the knock sensor can be distinguished between the individual groups of cylinders of the internal combustion engine. Due to the fact that such reference signals are present in most engine control units, the assignment of the output signals of the knock sensor to the individual cylinder groups can be implemented particularly easily.
  • An embodiment of the method which is characterized in that in order to distinguish knocking combustion from non-knocking combustion of the inner and outer groups of two cylinders of the internal combustion engine as knockers. characteristic factor the different useful / noise ratio is used for the output signal of the knock sensor is particularly preferred.
  • the knock detection factor can be determined in this way in a simple manner, so that the method can be carried out inexpensively.
  • an embodiment of the method is preferred in which a so-called measurement window is generated as a function of the crankshaft position, within which the distinction between knocking and non-knocking combustion is made.
  • the knock sensor is arranged essentially symmetrically to the defined groups of cylinders. In this way, different knock detection factors can be determined, so that the method can be carried out relatively easily.
  • the knock sensor is arranged approximately in the middle of the four cylinders of an internal combustion engine arranged in series.
  • the arrangement of the knock sensor is relatively uncritical. It can be adapted to the spatial conditions of the internal combustion engine without slight deviations in the arrangement leading to measurement errors.
  • the advantages mentioned also result in a device with the features of claim 9. Because a knock signal evaluation circuit is provided, with which the output signals of the knock sensor are processed, and a comparator circuit is provided, which outputs the output signals of the knock signal evaluation circuit processed taking into account a knock detection factor and emits a knock signal in the event of knocking combustion, a simple circuit for knock detection of an internal combustion engine is provided which can be implemented inexpensively and can be operated relatively reliably.
  • the advantages mentioned can also be achieved in that the said device is used as part of an engine control unit of an internal combustion engine, in particular influencing the ignition and / or the injection of the internal combustion engine.
  • Such an integration of the device into an engine control unit means a space-saving and therefore inexpensive implementation of the device, while at the same time providing high functional reliability.
  • FIG. 2 shows a rough functional sketch of an internal combustion engine with four cylinders connected in series
  • FIG. 3 shows a schematic diagram of an internal combustion engine with an electronic control device, which includes the device for detecting knocking combustion
  • FIG. 4 shows a basic circuit diagram of a knock sensor with a downstream control circuit
  • Figure 5 is a diagram illustrating the implementation of the method for detecting knocking combustion.
  • the method or the device for detecting knocking combustion in an internal combustion engine can in principle be used with all engines which have a plurality of cylinder groups with a distinguishable knock detection factor.
  • the method and the device are particularly preferably used in four-cylinder engines, the cylinders of which can be combined in two groups: two outer and two inner cylinders. It is essential for the method that the ignition of the cylinders is selected such that cylinders of different groups are always supplied with an ignition spark one after the other.
  • the firing sequence 1-3-4-2 or 1-2-4-3 that is common in four-cylinder engines can be used.
  • a prerequisite for carrying out the method is a reference mark on the crankshaft, so that its position in relation to a fixed system can be detected, for example with a sensor.
  • the ignition sequence mentioned is reproduced in FIG. 1 in a diagram in which the detection of the reference mark on the crankshaft is indicated in an uppermost graph by individual pulses. There is a 360 ° rotation of the cube shaft between two pulses.
  • the firing event of a cylinder is indicated by a continuous line, which is indicated by downward-pointing pulses and symbolized lightning bolts.
  • the closing and opening process of an ignition coil is to be indicated by the negative impulses.
  • FIG. 2 shows, roughly schematically, an internal combustion engine with four cylinders arranged in series, the associated numbers 1, 2, 3 and 4 of which are reproduced. are given.
  • the sketch shows the radiator fan on the left and the output of the internal combustion engine on the right.
  • a knock sensor K is indicated by a dot in the middle of the four cylinders.
  • FIGS. 1 and 2 By looking at FIGS. 1 and 2, it can be seen which of the four cylinders of the internal combustion engine according to FIG. 2 is controlled in the ignition process outlined in FIG. 1.
  • FIG 3 also shows an internal combustion engine 10 with four cylinders arranged in series, the spark plugs ZI to Z4 of which are sketched.
  • a knock sensor K is again drawn, which is connected to an engine control unit 20 via a line I--.
  • the internal combustion engine 10 is also provided with a sensor that detects the speed of the internal combustion engine, a speed sensor DG, which is connected to the engine control unit 20 via an associated line.
  • the sketch according to FIG. 3 also indicates that the engine control unit 20 is supplied with further information, for example about the load, the temperature or about the supply voltage U BATT of the system.
  • the engine control unit 20 outputs control signals to the ignition and to the injection of the internal combustion engine as output signals. For details of the otherwise known functions of the engine control devices need not be discussed further here.
  • the engine control unit 20 comprises a knock signal evaluation circuit KSA, to which the output signals of the knock sensor K are fed via the line 1 ⁇ r.
  • the engine control unit includes a microprocessor ⁇ C, which serves as a central control unit.
  • the above-mentioned additional signals such as load, temperature and supply voltage are fed to an A / D converter 22 which also receives the output signals of the knock signal evaluation circuit KSA.
  • Output signals of the A / D converter 22 are output to the central microprocessor ⁇ C. Its output signals are emitted via a suitable output stage circuit E to each of the lines assigned to the ignition Z or injection E.
  • the output signals of knock sensor K are output via line ⁇ to knock signal evaluation circuit KSA, which has an amplifier V, a filter F, a rectifier G and an integrator I.
  • the output signals of the knock sensor are processed by the individual elements connected in series.
  • the knock signal evaluation circuit KSA is connected via a line M to the microprocessor ⁇ C of the motor control circuit 20 shown in FIG.
  • the output signals of the knock signal evaluation circuit KSA are fed via a line L A to the A / D converter 22 which, after processing the signals, forwards them to the microprocessor ⁇ C.
  • the microprocessor ⁇ C has a cylinder evaluation circuit or cylinder assignment circuit 30 which assigns the output signals of the A / D converter to the cylinder 1, 2, 3 or 4 of the internal combustion engine (see FIG. 3).
  • the assignment of the signals to the individual cylinders can be seen from the output lines of the cylinder assignment circuit 30 identified by the numbers * 1-, -2-, * 3 * and » 4 1 .
  • Circuit elements 31 and 32 arranged downstream of the cylinder assignment circuit determine the current value of the knock sensor and the mean value of the output signal of the knock sensor, taking previous work cycles into account.
  • the output signals of these two circuits 31 and 32 are fed to a comparator circuit 33 which compares these two values with one another.
  • the comparator or comparator circuit 33 has four output lines assigned to the cylinders 1, 2, 3 and 4, which are identified in FIG. 4 by the corresponding numbers of the cylinders. On the basis of the signals appearing on these lines, a distinction can be made as to whether knocking or non-knocking combustion of the cylinder assigned to the respective line has taken place. In FIG. 4, it is assumed that knocking combustion of cylinder 1 was determined on the basis of the signal detected by knock sensor K. The output of the comparator 33, which is assigned to the cylinder 1, is therefore indicated by a large arrow, while the other outputs have an arrow shown in the normal manner.
  • the microprocessor ⁇ C Based on the detection of knocking combustion via line Z, the microprocessor ⁇ C sends a corresponding signal to the ignition output stage 35, which then, marked by a broad arrow, influences the ignition of the cylinder 1 accordingly.
  • the integrator I of the knock signal evaluation circuit KSA is acted upon by a measurement window signal, that is to say the integration of the input signal takes place only during a predetermined range of a crankshaft angle.
  • the output signal of the knock signal evaluation circuit KSA is output to the A / D converter 22 via the line L A and the digitized value of ⁇ C is requested at a defined time. In this way, knock detection interference is reduced to a minimum.
  • the processed output signal of the speed sensor DG (see FIG. 3) of the internal combustion engine 10 is at the very top of the illustration in FIG. or a so-called tooth signal.
  • a reference mark signal t R is indicated, which has individual pulses and represents the position of the crankshaft.
  • This reference mark signal is generated in the usual way, for example by the engine control unit 20.
  • M denotes the measurement window signal sketched on line M shown in FIG. 4, which ultimately serves to evaluate the output signal of knock sensor K.
  • FIG. 5 it is also indicated by horizontal arrows which of the two groups of cylinders of the internal combustion engine is taken into account in the current evaluation of the output signal of knock sensor K.
  • the output signals of the knock sensor are evaluated with an arrow marked with an for the outer cylinder group and with an arrow marked with i for the inner cylinder group.
  • cylinders 1 and 4 are to be assigned to the outer group of cylinders and cylinders 2 and 3 to the inner group of cylinders.
  • the knock detection factor referred to here as the K factor is used during a measurement window for the determination of knocking or non-knocking combustion. It can be seen that in the area in which the measuring window for the outer group of cycles is activated, the knock detection factors for the cylinders 1 and 4 are activated, while when the measurement window for the group of the inner cylinders 2 and 3 is activated, the knock detection factors for these cylinders 2 and 3 are used.
  • knocking combustions can be detected with a high degree of detection reliability in the internal combustion engine mentioned here.
  • the fact that two cylinders are combined for knock detection makes the method very simple and therefore inexpensive to implement.
  • Different knock detection factors are assigned to the two cylinder groups and are stored in the suitable memory 34 according to FIG. 4 as a fixed value, characteristic curve or as a characteristic diagram.
  • crankshaft has a reference mark and the sequence of the firings of the cylinders of the internal combustion engine has the firing sequence shown in FIG. 1. Each time alternately cylinders of the different groups are ignited.
  • the outer and inner cylinders can be selected with the reference mark on the crankshaft.
  • different knock detection factors are assigned to the outer and inner cylinders, the useful / noise ratio in the knock sensor signal being different between knocking combustion between the outer and inner cylinders, provided the sensor is approximately in the middle is arranged between the second and third cylinders (see FIGS. 2 and 3).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

Il est proposé un procédé pour la détection d'une combustion détonante dans un moteur à combustion interne, lequel est réalisé à l´aide d'un détecteur de détonation ainsi qu'au moyen d'un repère sur le vilebrequin du moteur à combustion interne. Le présent procédé est caractérisé en ce que pendant l'analyse des signaux du détecteur de détonation, une attribution de signaux de cliquetis à certains groupes de cylindres du moteur à combustion interne est effectuée à l'aide du repère susmentionné, et que, pour les différents groupes de cylindres, différents facteurs de reconnaissance de détonation sont consultés à l'aide desquels une combustion détonante est distinguée d'une combustion non-détonante au sein d'un groupe de cylindres.
PCT/DE1992/000246 1991-04-24 1992-03-26 Procede et dispositif pour la detection d'une combustion detonante dans un moteur a combustion interne WO1992019947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19914113290 DE4113290A1 (de) 1991-04-24 1991-04-24 Verfahren und vorrichtung zur erkennung einer klopfenden verbrennung in einer brennkraftmaschine
DEP4113290.4 1991-04-24

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WO1992019947A1 true WO1992019947A1 (fr) 1992-11-12

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WO (1) WO1992019947A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1865197A3 (fr) * 2006-06-02 2015-03-04 Honda Motor Co., Ltd. Dispositif de contrôle de cliquetis pour moteur polycylindrique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19709395C2 (de) * 1997-03-07 1998-12-24 Bosch Gmbh Robert Verfahren zur Klopfregelung in Mehrzylinder-Brennkraftmaschinen

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Publication number Priority date Publication date Assignee Title
JPS5672285A (en) * 1979-11-14 1981-06-16 Nippon Kayaku Co Ltd Rotary casing type liquid sealed rotary pump
JPS58174162A (ja) * 1982-04-06 1983-10-13 Toyota Motor Corp 内燃機関の点火時期制御方法
EP0121790A2 (fr) * 1983-03-10 1984-10-17 Robert Bosch Gmbh Méthode et dispositif pour la reconnaissance des cognements avec un filtre digital
JPS60230564A (ja) * 1984-04-28 1985-11-16 Mazda Motor Corp 多気筒エンジンの点火時期制御装置
JPS6258054A (ja) * 1985-09-05 1987-03-13 Mazda Motor Corp 多気筒エンジンのノツキング検出装置
EP0399068A1 (fr) * 1989-05-23 1990-11-28 Siemens Aktiengesellschaft Procédé pour le réglage du cliquetis dans les moteurs à combustion

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5672285A (en) * 1979-11-14 1981-06-16 Nippon Kayaku Co Ltd Rotary casing type liquid sealed rotary pump
JPS58174162A (ja) * 1982-04-06 1983-10-13 Toyota Motor Corp 内燃機関の点火時期制御方法
EP0121790A2 (fr) * 1983-03-10 1984-10-17 Robert Bosch Gmbh Méthode et dispositif pour la reconnaissance des cognements avec un filtre digital
JPS60230564A (ja) * 1984-04-28 1985-11-16 Mazda Motor Corp 多気筒エンジンの点火時期制御装置
JPS6258054A (ja) * 1985-09-05 1987-03-13 Mazda Motor Corp 多気筒エンジンのノツキング検出装置
EP0399068A1 (fr) * 1989-05-23 1990-11-28 Siemens Aktiengesellschaft Procédé pour le réglage du cliquetis dans les moteurs à combustion

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* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 92 (M-468)(2149) 9. April 1986 & JP,A,60 230 564 ( MAZDA K.K. ) 16. November 1985 *
PATENT ABSTRACTS OF JAPAN vol. 11, no. 250 (M-616)(2697) 14. August 1987 & JP,A,62 058 054 ( MAZDA MOTOR CORP. ) 13. März 1987 *
PATENT ABSTRACTS OF JAPAN vol. 5, no. 139 (M-86)(811) 3. September 1981 & JP,A,56 072 285 ( NIPPON DENSO K.K. ) 16. Juni 1981 *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 12 (M-269)(1449) 19. Januar 1984 & JP,A,58 174 162 ( TOYOTA JIDOSHA KOGYO K.K. ) 13. Oktober 1983 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1865197A3 (fr) * 2006-06-02 2015-03-04 Honda Motor Co., Ltd. Dispositif de contrôle de cliquetis pour moteur polycylindrique

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Publication number Publication date
DE4113290A1 (de) 1992-10-29

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